Literatura académica sobre el tema "Electrochemical device systems"
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Artículos de revistas sobre el tema "Electrochemical device systems"
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Menon, Ankitha, Abdullah Khan, Neethu T. M. Balakrishnan, Prasanth Raghavan, Carlos A. Leon y Leon, Haris Ali Khan, M. J. Jabeen Fatima y Peter Samora Owuor. "Advances in 3D Printing for Electrochemical Energy Storage Systems". Journal of Material Science and Technology Research 8 (30 de noviembre de 2021): 50–69. http://dx.doi.org/10.31875/2410-4701.2021.08.7.
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In the current scenario, energy generation is relied on the portable gadgets with more efficiency paving a way for new versatile and smart techniques for device fabrication. 3D printing is one of the most adaptable fabrication techniques based on designed architecture. The fabrication of 3D printed energy storage devices minimizes the manual labor enhancing the perfection of fabrication and reducing the risk of hazards. The perfection in fabrication technique enhances the performance of the device. The idea has been built upon by industry as well as academic research to print a variety of battery components such as cathode, anode, separator, etc. The main attraction of 3D printing is its cost-efficiency. There are tremendous savings in not having to manufacture battery cells separately and then assemble them into modules. This review highlights recent and important advances made in 3D printing of energy storage devices. The present review explains the common 3D printing techniques that have been used for the printing of electrode materials, separators, battery casings, etc. Also highlights the challenges present in the technique during the energy storage device fabrication in order to overcome the same to develop the process of 3D printing of the batteries to have comparable performance to, or even better performance than, conventional batteries.
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Li, Shuang, Ziyue Qin, Jie Fu y Qiya Gao. "Nanobiosensing Based on Electro-Optically Modulated Technology". Nanomaterials 13, n.º 17 (23 de agosto de 2023): 2400. http://dx.doi.org/10.3390/nano13172400.
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At the nanoscale, metals exhibit special electrochemical and optical properties, which play an important role in nanobiosensing. In particular, surface plasmon resonance (SPR) based on precious metal nanoparticles, as a kind of tag-free biosensor technology, has brought high sensitivity, high reliability, and convenient operation to sensor detection. By applying an electrochemical excitation signal to the nanoplasma device, modulating its surface electron density, and realizing electrochemical coupling SPR, it can effectively complete the joint transmission of electrical and optical signals, increase the resonance shift of the spectrum, and further improve the sensitivity of the designed biosensor. In addition, smartphones are playing an increasingly important role in portable mobile sensor detection systems. These systems typically connect sensing devices to smartphones to perceive different types of information, from optical signals to electrochemical signals, providing ideas for the portability and low-cost design of these sensing systems. Among them, electrochemiluminescence (ECL), as a special electrochemically coupled optical technology, has good application prospects in mobile sensing detection due to its strong anti-interference ability, which is not affected by background light. In this review, the SPR is introduced using nanoparticles, and its response process is analyzed theoretically. Then, the mechanism and sensing application of electrochemistry coupled with SPR and ECL are emphatically introduced. Finally, it extends to the relevant research on electrochemically coupled optical sensing on mobile detection platforms.
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Tsai, Han-Kuan A. y Marc Madou. "Microfabrication of Bilayer Polymer Actuator Valves for Controlled Drug Delivery". JALA: Journal of the Association for Laboratory Automation 12, n.º 5 (octubre de 2007): 291–95. http://dx.doi.org/10.1016/j.jala.2007.06.010.
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Drug delivery is still a challenging mission in therapeutic treatment. Research on biomedical micro-electromechanical systems (BioMEMS) has led to a diverse range of microsystems for curative applications. This paper introduces miniaturized controlled valves and drug reservoirs for drug delivery systems. Detailed microfabrication processes, optimized package, and optical/electrochemical detection of the proposed device are described. The release mechanism of the device is controlled by a bilayer actuator valve, which consists of a conductive polymer polypyrrole (PPy) film and a thin metal gold (Au) layer. The PPy layer is electrochemically polymerized on the Au layer. Therefore, further miniaturization of the device is possible through microfabrication of the Au layer. A polydimethylsiloxane (PDMS) package is also introduced to prevent the flap from being blocked by the surrounding tissue of the human body. In addition, a parylene coating is applied to minimize the permeability of PDMS. The release process is then verified by an optical and electrochemical detection system.
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Vizza, Martina, Giulio Pappaianni, Walter Giurlani, Andrea Stefani, Roberto Giovanardi, Massimo Innocenti y Claudio Fontanesi. "Electrodeposition of Cu on PEDOT for a Hybrid Solid-State Electronic Device". Surfaces 4, n.º 2 (24 de mayo de 2021): 157–68. http://dx.doi.org/10.3390/surfaces4020015.
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Conductive polymers are nowadays attracting great attention for their peculiar mechanical, electrical and optical proprieties. In particular, PEDOT can be used in a wide range of innovative applications, from electroluminescent devices to photovoltaics. In this work, the electrochemical deposition of 3,4 ethylenedioxythiophene (EDOT) was performed on various substrates (ITO, thin films of gold and palladium on silicon wafers) by means of both potentiostatic and potentiodynamic techniques. This was intended to further expand the applications of electrochemically deposited PEDOT, particularly regarding the preparation of thin films in tight contact with electrode surfaces. This allows one to obtain systems prone to be used as electrodes in stacked devices. Chronoamperometric experiments were performed to study the nucleation and growth process of PEDOT. SEM, ESEM and AFM analysis allowed the characterization of the morphology of the polymeric films obtained. Raman and visible spectroscopy confirmed the high-quality of the coatings on the different substrates. Then, the PEDOT films were used as the base material for the further electrodeposition of a copper layer. In this way, a hybrid electronic device was obtained, by using electrochemical methods only. The high conductivity and ohmic behavior of the device were confirmed over a wide range of frequencies with electrical impedance spectroscopy analysis.
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Plaksin, S. V., А. М. Мukhа, D. V. Ustymenko, М. Y. Zhytnyk, R. Y. Levchenko, Y. М. Chupryna y О. O. Holota. "Method of Operational Control and Management of Electrochemical Energy Storage Device in the Systems of Electricity Supply of Vehicles". Science and Transport Progress, n.º 6(96) (20 de diciembre de 2021): 39–52. http://dx.doi.org/10.15802/stp2021/258172.
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Purpose. The main purpose of our work is to develop a method of rational control of dynamic operation modes of electrochemical energy storage devices to increase the efficiency of their operation as part of the energy supply systems of vehicles. Methodology. The authors reviewed the world literature on the topic of the work. The existing control methods of electrochemical energy storage devices were systematized and classified. Peculiarities and possibilities of their application taking into account the specifics of operation on vehicles, which are characterized by dynamic modes with unpredictable changes in the energy balance due to uncontrolled undercharges and overcharges were taken into account. The analysis of existing control methods showed that their common disadvantage is the use as information parameters to control and manage the operation modes of storage device, such as voltage and operating current, the values of which do not correspond to the current energy state of the device due to the fleeting nature of transient electrochemical processes in the device during operation in dynamic modes. The conclusion is made about the need to take into account the energy parameters of storage devices in the process of managing dynamic modes, which most fully and objectively reflect their performance. The advantage of pulse control methods of storage devices in dynamic modes of operation over DC methods is shown. Findings. The authors substantiated and experimentally confirmed the versatility of the developed galvanostatic method, which allows simultaneous control of the current energy state of the storage device and operational management of dynamic modes of its operation using a common criterion of control and management – the utilization factor of active materials, the information equivalent of which is the value of the area under the depolarization curve on the response signal of the device to the test pulse. Originality. For the first time it is proposed to combine the functions of control of the current energy state of the storage device and operational management of the dynamic modes of its operation with the use of the utilization factor of active materials. Practical value. The obtained results can be used to ensure the optimal operation mode of energy storage in the power supply systems of vehicles.
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Komal, Baby, Madhavi Yadav, Manindra Kumar, Tuhina Tiwari y Neelam Srivastava. "Modifying potato starch by glutaraldehyde and MgCl2 for developing an economical and environment-friendly electrolyte system". e-Polymers 19, n.º 1 (16 de julio de 2019): 453–61. http://dx.doi.org/10.1515/epoly-2019-0047.
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AbstractBiodegradable polymer electrolyte systems are the most sought over option for cheap and energy efficient storage devices. Present paper discusses the results of potato starch + MgCl2 system which satisfy the technical and economic criteria to become a potential candidate for future electrolyte systems. The developed system has high ionic conductivity (~3.43 × 10-2 S/cm), low relaxation time (75 μs) and wide electrochemical stability window (ESW ~4.6 V). The phase angle approaches -79° and maintains its value for 10 Hz to 1 kHz frequency range. The prepared material is a free standing film which can be bended and twisted up to 90°, which makes it suitable for flexible electrochemical device fabrication. The equivalent series resistance (ESR) is quite low (3.41 Ω) and self-resonance frequency below which energy can be efficiently stored is approximately 0.1 MHz. Hence the present study reports an economical, easy to handle and environment friendly electrolyte suitable for electrochemical device fabrication.
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Wang, Shijie, Xi Chen, Chao Zhao, Yuxin Kong, Baojun Lin, Yongyi Wu, Zhaozhao Bi et al. "An organic electrochemical transistor for multi-modal sensing, memory and processing". Nature Electronics 6, n.º 4 (27 de abril de 2023): 281–91. http://dx.doi.org/10.1038/s41928-023-00950-y.
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AbstractBy integrating sensing, memory and processing functionalities, biological nervous systems are energy and area efficient. Emulating such capabilities in artificial systems is, however, challenging and is limited by the device heterogeneity of sensing and processing cores. Here we report an organic electrochemical transistor capable of sensing, memory and processing. The device has a vertical traverse architecture and a crystalline–amorphous channel that can be selectively doped by ions to enable two reconfigurable modes: a volatile receptor and a non-volatile synapse. As a volatile receptor, the device is capable of multi-modal sensing and is responsive to stimuli such as ions and light. As a non-volatile synapse, it is capable of 10-bit analogue states, low switching stochasticity and good state retention. We also show that the homogeneous integration of the devices could provide functions such as conditioned reflexes and could be used for real-time cardiac disease diagnoses via reservoir computing.
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Pansodtee, Pattawong, John Selberg, Manping Jia, Mohammad Jafari, Harika Dechiraju, Thomas Thomsen, Marcella Gomez, Marco Rolandi y Mircea Teodorescu. "The multi-channel potentiostat: Development and evaluation of a scalable mini-potentiostat array for investigating electrochemical reaction mechanisms". PLOS ONE 16, n.º 9 (16 de septiembre de 2021): e0257167. http://dx.doi.org/10.1371/journal.pone.0257167.
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A potentiostat is an essential piece of analytical equipment for studying electrochemical devices and reactions. As the design of electrochemical devices evolve, applications for systems with multiple working electrodes have become more common. These applications drive a need for low-cost multi-channel potentiostat systems. We have developed a portable, low-cost and scalable system with a modular design that can support 8 to 64 channels at a cost as low as $8 per channel. This design can replace the functionality of commercial potentiostats which cost upwards of $10k for certain applications. Each channel in the multi-channel potentiostat has an independent adjustable voltage source with a built-in ammeter and switch, making the device flexible for various configurations. The multi-channel potentiostat is designed for low current applications (nA range), but its purpose can change by varying its shunt resistor value. The system can either function as a standalone device or remotely controlled. We demonstrate the functionality of this system for the control of a 24-channel bioelectronic ion pump for open- and closed- loop control of pH.
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Xue, Wuhong, Xiao-Hong Xu y Gang Liu. "Solid-State Electrochemical Process and Performance Optimization of Memristive Materials and Devices". Chemistry 1, n.º 1 (21 de marzo de 2019): 44–68. http://dx.doi.org/10.3390/chemistry1010005.
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As an emerging technology, memristors are nanoionic-based electrochemical systems that retains their resistance state based on the history of the applied voltage/current. They can be used for on-chip memory and storage, biologically inspired computing, and in-memory computing. However, the underlying physicochemical processes of memristors still need deeper understanding for the optimization of the device properties to meet the practical application requirements. Herein, we review recent progress in understanding the memristive mechanisms and influential factors for the optimization of memristive switching performances. We first describe the working mechanisms of memristors, including the dynamic processes of active metal ions, native oxygen ions and other active ions in ECM cells, VCM devices and ion gel-based devices, and the switching mechanisms in organic devices, along with discussions on the influential factors of the device performances. The optimization of device properties by electrode/interface engineering, types/configurations of dielectric materials and bias scheme is then illustrated. Finally, we discuss the current challenges and the future development of the memristor.
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Sreenivasan, Sreeprasad T. "Magnetism to Engineer Electrocatalyst and Device Performances". ECS Meeting Abstracts MA2022-02, n.º 46 (9 de octubre de 2022): 1720. http://dx.doi.org/10.1149/ma2022-02461720mtgabs.
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Electrocatalytic devices such as fuel cells and redox flow batteries emerged as an appealing platform for renewable energy applications. The application of magnetic field to electrochemical systems, through diverse mechanisms, demonstrated good potential to enhance the efficacy of the energy-relevant electrocatalytic reactions. This talk will discuss some of our results in magnetic field-assisted enhancement in the electrocatalytic activity of molecular and network catalysts. The magnetic field-assisted enhancement in the performance of electrocatalytic devices and its fundamentals unraveled through a combined experimental-theoretical exploration and diverse microscopic and spectroscopic techniques, including electron spin resonance (ESR) spectroscopy, scanning electrochemical microscopy (SECM), and X-ray absorption spectroscopy (XAS), will be presented.
Tesis sobre el tema "Electrochemical device systems"
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Kawahara, Jun. "Novel architectures for flexible electrochemical devices and systems". Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91273.
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Electrically conducting polymers were discovered in the late 1970s. This finding generated a whole new research area named organic electronics, an area which has attracted great interest and tremendous achievements, in terms of devices and applications, have been reached by different research groups all over the world. Replacing inorganic materials by their organic counterparts in various kinds of electronic devices provides novel device functionalities as well as new opportunities in device manufacturing. One of the major advantages of utilizing organic materials in electronic devices is the high degree of freedom regarding fabrication methods. Since organic materials can be processed from solution various printing, coating and lamination techniques can be used to manufacture entire electronic systems on flexible carriers and substrates in a truly reel-to-reel fashion. The main theme of this thesis relates to exploring novel device architectures to enable easy manufacturing of flexible electrochromic displays based on organic materials. After the introduction, the second part of the thesis treats some of the fundamentals of conducting polymers, and the third part explains the building blocks of matrix-addressed electrochromic displays: those systems combine electrochemical transistors and electrochromic display pixels. A brief introduction to printed electronics is also given in the fourth section. Then, active matrix addressed displays utilizing electronic vias manufactured through the substrate, which enable to use the substrate more efficiently in the resulting three-dimensional architecture, are presented in the fifth section. This novel system arrangement results in a matrix-addressed display with a relatively high fill-factor since its subcomponents are located on opposite sides of the substrate. The sixth section of the thesis is related to the achievement of passive matrix addressed displays. The architecture and the manufacturing process of these electrochromic displays are both very simple: an electrolyte is sandwiched in between the counter and the pixel electrode layers. The electrode materials chosen results in a non-linear current versus voltage characteristics, which enables matrix addressability also without the transistors. At last, in the seventh section, nanofibrillated cellulose (NFC) is used as the scaffold for either an electroactive polymer or the electrolyte. Various components, such as electrochromic pixels and electrochemical transistors, can be built from the resulting solid films thanks to the stable, soft and tacky properties of the hybridized NFC layer. Hence, a new concept for integration and reconfiguration of electronic systems consisting of electrochemical devices is achieved.
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Grove, Fraser Traves Smith. "Impedance Sensing of N2A and Astrocytes as Grounds for a Central Nervous System Cancer Diagnostic Device". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/782.
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This thesis utilizes previously described manufacturing and design techniques for the creation of a PDMS-glass bonded microfluidic device, capable of electrochemical impedance spectroscopy (EIS). EIS has been used across various fields of research for different diagnostic needs. The major aim of this thesis was to capture cancerous and non-cancerous cells between micron sized electrodes within a microfluidic path, and to complete analysis on the measured impedances recorded from the two differing cell types. Two distinct ranges of impedance frequency were analyzed – the α dispersion range, which quantifies the impedance of the membranes of the cells of interest, and the β dispersion range, which quantifies the impedance of the cytosol of the cells of interest. This thesis is unique in the fact that it looks at the cellular impedances of two types of neural cells, which has not been documented previously in literature. The type of cancerous cells analyzed were Neuro-2-A cells, an immortalized line of murine glio/neuroblastoma. The type of non-cancerous cells analyzed were murine primary astrocytes, a mortal line of neurological support cells found throughout the nervous system, and with great abundance in the brain.
By using a LabView program coded by a previous Cal Poly student, a sweep scan across a wide frequency range was completed on both cell types, and statistical analysis was completed on target frequencies of interest. A significant difference was found between the two cell lines’ membrane impedances, however no difference was found between the cytoplasm impedances.
In total, this thesis aimed to fabricate a reusable microfluidic device capable of EIS for future Cal Poly students, create a protocol suitable for cell culturing and device operation, and to lay a foundation of knowledge for impedance comparisons regarding neural cancerous and non-cancerous cells.
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Vasudev, Abhay. "Electrochemical Immunosensing of Cortisol in an Automated Microfluidic System Towards Point-of-Care Applications". FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/956.
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This dissertation describes the development of a label-free, electrochemical immunosensing platform integrated into a low-cost microfluidic system for the sensitive, selective and accurate detection of cortisol, a steroid hormone co-related with many physiological disorders. Abnormal levels of cortisol is indicative of conditions such as Cushing’s syndrome, Addison’s disease, adrenal insufficiencies and more recently post-traumatic stress disorder (PTSD). Electrochemical detection of immuno-complex formation is utilized for the sensitive detection of Cortisol using Anti-Cortisol antibodies immobilized on sensing electrodes. Electrochemical detection techniques such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) have been utilized for the characterization and sensing of the label-free detection of Cortisol. The utilization of nanomaterial’s as the immobilizing matrix for Anti-cortisol antibodies that leads to improved sensor response has been explored. A hybrid nano-composite of Polyanaline-Ag/AgO film has been fabricated onto Au substrate using electrophoretic deposition for the preparation of electrochemical immunosening of cortisol. Using a conventional 3-electrode electrochemical cell, a linear sensing range of 1pM to 1µM at a sensitivity of 66µA/M and detection limit of 0.64pg/mL has been demonstrated for detection of cortisol. Alternately, a self-assembled monolayer (SAM) of dithiobis(succinimidylpropionte) (DTSP) has been fabricated for the modification of sensing electrode to immobilize with Anti-Cortisol antibodies. To increase the sensitivity at lower detection limit and to develop a point-of-care sensing platform, the DTSP-SAM has been fabricated on micromachined interdigitated microelectrodes (µIDE). Detection of cortisol is demonstrated at a sensitivity of 20.7µA/M and detection limit of 10pg/mL for a linear sensing range of 10pM to 200nM using the µIDE’s.
A simple, low-cost microfluidic system is designed using low-temperature co-fired ceramics (LTCC) technology for the integration of the electrochemical cortisol immunosensor and automation of the immunoassay. For the first time, the non-specific adsorption of analyte on LTCC has been characterized for microfluidic applications. The design, fabrication technique and fluidic characterization of the immunoassay are presented. The DTSP-SAM based electrochemical immunosensor on µIDE is integrated into the LTCC microfluidic system and cortisol detection is achieved in the microfluidic system in a fully automated assay. The fully automated microfluidic immunosensor hold great promise for accurate, sensitive detection of cortisol in point-of-care applications.
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Linzen, Dirk [Verfasser]. "Impedance-Based Loss Calculation and Thermal Modeling of Electrochemical Energy Storage Devices for Design Considerations of Automotive Power Systems / Dirk Linzen". Aachen : Shaker, 2006. http://d-nb.info/1166515028/34.
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Öberg, Månsson Ingrid. "Electroanalytical devices with fluidic control using textile materials and methods". Licentiate thesis, KTH, Fiberteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279327.
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This thesis, written by Ingrid Öberg Månsson at KTH Royal Institute of Technology and entitled “Electroanalytical devices with fluidic control using textile materials and methods”, presents experimental studies on the development of textile based electronic devices and biosensors. One of the reasons why this is of interest is the growing demand for integrated smart products for wearable health monitoring or energy harvesting. To enable such products, new interdisciplinary fields arise combining traditional textile technology and electronics. Textile based devices have garnered much interest in recent years due to their innate ability to incorporate function directly into, for example, clothing or bandages by textile processes such as weaving, knitting or stitching. However, many modifications of yarns required for such applications are not available on an industrial scale. The major objective of this work has been to study how to achieve the performance necessary to create electronic textile devices by either coating yarns with conductive material or using commercially available conductive yarns that are functionalized to create sensing elements. Further, liquid transport within textile materials has been studied to be able to control the contact area between electrolyte and electrodes in electrochemical devices such as sensors and transistors. Yarns with specially designed cross-sections, traditionally used in sportswear to wick sweat away from the body and enhance evaporation, was used to transport electrolyte liquids to come in contact with yarn electrodes. The defined area of the junction where the fluidic yarn meets the conductive yarn was shown to increase stability of the measurements and the reproducibility between devices. The results presented in the two publications of this thesis as well as additional results presented in the thesis itself show the promising potential of using textile materials to integrate electronic and electrochemical functionality in our everyday life. This is shown by using basic textile materials and processing techniques to fabricate complex devices for various application areas such as sensors and diagnostics as well as electrical and energy harvesting components.Denna avhandling, skriven av Ingrid Öberg Månsson vid Kungliga Tekniska Högskolan och titulerad ”Elektroanalytiska sensorer med vätskekontroll integrerad genom användande av textila material och metoder”, presenterar experimentella studier inom utvecklingen av textilbaserade elektroniska komponenter och biosensorer. Detta är av intresse på grund av den ökade efterfrågan på integrerade smarta produkter som till exempel bärbara sensorer för hälsoövervakning eller för att samla upp och konvertera energi till elektricitet. För att möjliggöra denna typ av produkter föds nya interdisciplinära fält där traditionell textilteknologi och elektronik möts. Textilbaserade enheter har väckt stort intresse under de senaste åren på grund av den naturliga förmågan att integrera funktion i till exempel kläder eller förband genom textila tillverkningsprocesser som väveri, stickning eller sömnad. Många modifikationer hos garner som krävs för att möjliggöra sådana tillämpningar är dock inte tillgängliga i större skala. Därför har det huvudsakliga syftet med denna studie varit att undersöka hur man kan uppnå den prestanda som krävs för att tillverka elektroniska textila komponenter, antingen genom att belägga garner med elektroniskt ledande material eller genom att använda kommersiellt tillgängliga ledande garner som sedan modifieras kemiskt för att skapa sensorer. Utöver detta har vätsketransport inom textila material studerats för att kunna styra och kontrollera kontaktytan mellan elektrolyt och elektroder i elektrokemiska enheter så som sensorer och transistorer. Garner med speciella tvärsnitt, som traditionellt använts i sportkläder för att transportera svett bort från kroppen och underlätta avdunstning, har använts för att transportera elektrolytvätska till elektroder av garn. Den definierade kontaktytan där det vätsketransporterade garnet korsar elektrodgarnet har visats öka stabiliteten av mätningen och reproducerbarheten mellan mätenheter. Resultaten som presenteras i de två artiklar som denna avhandling bygger på samt i avhandlingen själv visar på lovande potential för användandet av textila material för att integrera elektronisk och elektrokemisk funktionalitet i våra vardagsliv. Detta har uppnåtts genom att använda grundläggande textila material och tillverkningsprocesser för att tillverka komplexa enheter för olika tillämpningsområden så som sensorer för diagnostik samt elektroniska komponenter.
QC 2020-08-21
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Baccour, Mohamed. "Monolithes à porosité multi-échelle comme supports pour la réduction enzymatique du CO2 en molécules d'intérêts". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2018. http://www.theses.fr/2018ENCM0004.
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La conversion du dioxyde de carbone en molécules d'intérêts est un enjeu majeur de notre société moderne. Actuellement, ces réactions sont très coûteuses en énergie, impliquent de hautes pressions et températures et sont faiblement sélectives. Une alternative séduisante serait l’utilisation d’enzymes redox, i.e. des déshydrogénases, qui fonctionnent à pH neutre, température et pression ambiantes et sont très sélectives. Le frein à leur utilisation est leur stabilité et le fait qu’elles nécessitent la présence du cofacteur nicotinamide adénine dinucléotide (NAD+ / NADH), couteux et délicat à régénérer. L’immobilisation de déshydrogénases sur des supports poreux monolithiques est proposée dans ce travail de thèse dans l’objectif de développer des réacteurs en flux continu.Dans un premier temps, des monolithes siliciques à porosité hiérarchique macro- et mésoporeux ont été préparés. Des macropores plus larges allant jusqu’à 35-50 microns ont été obtenus. Dans un second temps, des synthèses de monolithes de carbone à porosité hiérarchique en une étape ou en plusieurs étapes par dépôt de carbone sur des monolithes siliciques (greffage de saccharose, suivi de polymérisation et carbonisation) ont été développées. Ce travail a permis un contrôle fin de la macro-, méso et microporosité. Des monolithes de carbone avec une surface spécifique supérieure à 1200 m2.g-1 ont notamment pu être obtenus. Ces matériaux présentent non seulement une macroporosité large (35-50 µm), mais également une mésoporosité bimodale. Au-delà d’une porosité multi-échelle, ces matériaux carbonés présentent l’avantage d’être conducteurs du courant électrique. Ils peuvent ainsi être utilisés comme support pour l’électrocatalyse enzymatique. Ces monolithes de carbones ont été utilisés pour l’immobilisation de formiates déshydrogénases connus pour pouvoir réduire le CO2 en présence du cofacteur NADH. La régénération du cofacteur est étudiée soit par voie électrochimique soit par voie biocatalytique à l'aide d'une deuxième enzyme la phosphite déshydrogénase. Des études de fonctionnalisation des monolithes carbonés pour la co-immobilisation des enzymes et du cofacteur ont également été initiéesCarbon dioxide (CO2) is a greenhouse gas that results, in part, from human activities and causes global warming and climate change. According to the International Energy Agency, global CO2 emissions from fossil-fuel combustion reached a record high of 31.3 gigatonnes in 2011. The concept of the methanol economy, advocated by Nobel laureate Prof. George A. Olah back in the 1990s, hinges on the chemical recycling of CO2 to methanol and derived, suggesting methanol as a key substitute fuel and starting material for valuable chemicals. The recycling conversion of CO2 could be a rational way to develop an anthropogenic short-term carbon cycle. With this aim, The design of functional porous architectures depicting hierarchical and interconnected pore networks has emerged as a challenging field of research. Particularly, porous monoliths offer many advantages and can be employed as flow-through reactors for separation, catalysis and biocatalysis. This study focuses on the design of monoliths with hierarchical porosity and high surface area. Firstly, silica monoliths with both homogeneous macro- and mesopores were prepared using sol-gel chemistry and spinodal decomposition using PEO polymers. Macropore (up to 30 microns) and mesopore (up to 20 nm) diameters of the monoliths were controlled by modifying various experimental parameters (PEO molecular weight, addition of surfactants, different basic post-treatments, different temperatures, etc.). Secondly, carbonaceous replica have been prepared through hydrothermal carbonization of sucrose, subsequent pyrolysis and silica etching. These materials present large interconnected flow-trough macropores, a bimodal mesoporosity, a high surface area (up to 1400 m2 g-1) and high meso- and macropore volumes.Different enzymes were immobilized onto the monoliths amongst which formate dehydrogenases. Flow-through reactors were engineered and continuous flow biocatalysis was performed. In such systems, straightforward processes for the in situ regeneration of the enzyme cofactor, i.e. 1,4-NADH wrer developped. Flow-through reactors and their use for the enzymatic reduction of carbon dioxide into formate were designed
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Gassull, Daniel [Verfasser]. "Electrochemical sensing of surface reactions on Gallium Arsenide based semiconductor devices functionalized with bio-organic molecular systems / Daniel Gassull". 2007. http://d-nb.info/986097047/34.
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(9189602), Tran NH Nguyen. "Printable Electrochemical Biosensors for the Detection of Neurotransmitter and Other Biological Molecule". Thesis, 2020.
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Glutamate is the principal excitatory neurotransmitter in the central nervous system. As one of the most abundant neurotransmitters, glutamate plays an essential role in many processes of the central nervous system and beyond. As a result, any disruption that causes an abnormal glutamate level can significantly impact the central nervous system's neurological functions. Glutamate excitotoxicity is a neuropathology that persists in many neurodegenerative disorders such as Parkinson's and Alzheimer's disease as well as in the traumatic brain and spinal cord injuries. Thus, the ability to obtain precise information about the extracellular glutamate level in the living brain and spinal cord tissue may provide new insights into the fundamental understanding of glutamate in neurological disorders and neurophysiological phenomena.
Conventional bioanalytical techniques that characterize glutamate levels in vivo have a low spatiotemporal resolution that has impeded our understanding of this dynamic event. The electrochemical sensor has emerged as a promising solution that can satisfy the requirement for highly reliable and continuous monitoring methods with an excellent spatiotemporal resolution for the characterization of extracellular glutamate concentration. In this thesis, I present various amperometric biosensors fabricated using a simple direct ink writing technique for ex vivo and in vivo glutamate monitoring.
The amperometric biosensor is fabricated by immobilizing glutamate oxidase on nanocomposite electrodes made of platinum nanoparticles, multiwalled carbon nanotubes, and a conductive polymer. The biosensors demonstrate good sensitivity and selectivity that can be inserted into a spinal cord and measure extracellular glutamate concentration. Additionally, another type of glutamate biosensor is fabricated from commercially available activated carbon with platinum microparticles. We utilize astrocyte cell culture to demonstrate our biosensor's ability to monitor the glutamate uptake process. We also present a direct measurement of glutamate release from optogenetic stimulation in mouse primary visual cortex brain slides.
Moreover, we explore a new type of material, perovskite nickelate-Nafion heterostructure, to fabricate biosensors and measure glutamate inside the mouse brain. Finally, by utilizing the nanocomposite ink and direct ink writing technique, we also fabricate the gold-ruthenium non-enzymatic glucose biosensor. We apply a modified Butler-Volmer non-linear model to evaluate the impact of geometrical and chemical design parameters of non-enzymatic biosensor performance.
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Sen, Sudeshna. "A Few Case Studies of Polymer Conductors for Lithium-based Batteries". Thesis, 2016. http://hdl.handle.net/2005/3019.
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The present thesis demonstrates and discusses polymeric ion and mixed ion-electron conductors for rechargeable batteries based on lithium viz. lithium-ion and lithium-sulphur batteries. The proposed polymer ion conductors in the thesis are discussed primarily as potential alternatives to conventional liquid and solid-crystalline electrolytes in lithium-ion batteries. These discussions are part of Chapters 2-4. On the other hand, the polymer based mixed ion-electron conductor is demonstrated as a novel electrode for lithium-Sulphur battery in Chapter 5. Possibility of application of polymer ion conductors is discussed in the context of Li-S battery in Chapter 6. A distinct correlation between the physical properties and electrochemical performance of the proposed conductors is highlighted in detail in this thesis. Systematic investigation of the ion transport mechanism in the polymeric ion conductors has been carried out using various spectroscopic techniques at different time and length scales. Such detailed investigations demonstrate the key structural and physical parameters for design of alternative polymer conductors for rechargeable batteries. Though the thesis discusses the various polymeric conductors in the context of lithium-based batteries, it is strongly felt that the design strategies are equally likely to be beneficial for different battery chemistries as well as for other electrochemical generation and storage devices. A brief discussion of the contents and highlights of the individual chapters are described below:
The thesis comprises of six Chapters.
Chapter 1 briefly reviews the important developments and materials of lithium-based batteries, with specific focus on Li-ion and Li-S batteries. It starts with discussions on different types of liquid, solid crystalline and solid-like electrolytes. Their materials characteristics, advantages and disadvantages are discussed in the context of secondary batteries such as lithium-ion and lithium-sulphur batteries. As prospective alternative electrolytes polymer based soft matter electrolytes are discussed in detail. Special emphasis is given to the recent developments in polymer electrolytes and their ion conduction mechanism, which are central themes to this thesis. The importance of investigation of charge transport, typically ion, on electrochemical processes is also briefly discussed in Chapter 1. A brief discussion about the characteristics, materials and non-trivialities of the electrochemical storage process in Li-S battery is also reviewed.
Chapter 2A demonstrates a binary polymer physical network based gel (PN-x) electrolyte, comprising of an ionic liquid confined inside a binary polymer system for electrochemical devices such as secondary batteries. The synthesis, physical property and electrochemical performances are studied as a function of content of one of the polymers in this Chapter. A physical network of two polymers with different functional groups leads to multiple interesting consequences. The polymer physical network characteristics determine all physical properties including electrochemical property of the ionic liquid integrated PN based GPE. The conductivities of the proposed gel are nearly an order in magnitude higher than the unconfined ionic liquid electrolyte and displays good dimensional stability and electrochemical performance in a separator-free battery configuration. The ac-impedance spectroscopy, steady shear viscosity measurement, dynamic rheology are employed to study physical properties of the proposed gel polymer electrolyte.
Chapter 2B discusses the detailed investigations of the ion transport mechanism of the gel polymer electrolyte, as discussed in Chapter 2A. Ion conduction mechanism is investigated in the light of ion diffusion and solvent dynamics of the entrapped ionic liquid inside the polymer. The studies reveal a heavy influence of network characteristics on the ion conduction mechanism. The influence of solvent dynamics on the ion transport is drastically altered by polymer physical network. Consequently, a drastic change in the ion mobility and nature of predominant charge carrier is observed in the polymer physical network based gel electrolyte. A clear transformation from dual ion conductivity to a predominantly anion conductivity is observed on going from single polymer to a dual polymer network. The spectroscopic tools such as pulsed field gradient nuclear magnetic resonance (PFG–NMR), Brillouin light scattering spectroscopy, ac-impedance spectroscopy, FT-Raman and FTIR spectroscopy were used to elucidate the ion transport mechanism in the Chapter.
Chapter 3 demonstrates a simple design strategy of gel polymer electrolyte comprising of a lithium salt (lithium bis(trifluoromethanesulfonyl) imide, LiTFSI) solvated by two plastic crystalline solvents, one a solid (succinonitrile, abbreviated as SN) and another a (room temperature) ionic liquid (1-butyl-1-methyl-pyrrolidinium bis(trifluoromethane sulfonyl) imide, (abbreviated as IL) confined inside a linear network of poly(methyl methacrylate) (PMMA). The concentration of the IL component determines the physical properties of the unconfined electrolyte and when confined inside the polymer network in gel polymer electrolyte. Intrinsic dynamics of one plastic crystal influences the conduction mechanism of gel polymer electrolytes. The enhanced disordering in the plastic phase of succinonitrile by IL doping alters both the local ion environment and viscosity. The proposed plastic crystal electrolytes show predominantly anion conduction (tTFSI ≈ 0.5) however, lithium transference number (tLi ≈ 0.2) is nearly an order higher than the ionic liquid electrolyte (IL-LiTFSI) (tLi ≈ 0.02-0.06), discussed in Chapter 2. The gel polymer electrolyte displayed high mechanical compliability, stable Li-electrode | electrolyte interface, low rate of Al corrosion and stable cyclability. The promising electrochemical performance further justifies simple strategy of employing mixed physical state plasticizers to tune the physical properties of polymer electrolytes requisite for application in rechargeable batteries.
Chapter 4A proposes a novel liquid dendrimer–based single ion conducting liquid electrolyte as potential alternative to conventional molecular liquid solvent–salt solutions and conventional solid polymer electrolytes for rechargeable batteries, sensors and actuators. The physical properties are investigated as a function of peripheral functionalities in the first generation poly(propyl ether imine) (G1-PETIM)–lithium salt complexes. The change in peripheral group simultaneously affects the effective physical properties viz. viscosity, ionic conductivity, ion diffusion coefficients, transference numbers and also the electrochemical response. The specific change from ester (–COOR) to cyano (–CN) terminated peripheral group resulted in a remarkable switch over from a high cation (tLi+ = 0.9 for –COOR) to a high anion (tPF6- = 0.8 for –CN) transference number.
Chapter 4B presents an analysis of the frequency dependent ionic conductivity of single ion dendrimer conductors by using time temperature scaling principles (TTSPs) and dielectric modeling of the electrode polarization. The TTSP provides information on the salt dissociation and number density of mobile charges and hence provides direct insights into the ion conduction mechanism. Summerfield and Baranovskii–Cordes scaling laws, which are well known TTSPs, have been applied to analyze the ion conductivity. The electrode polarization, which quantifies the number density of mobile charges and ionic mobility, is studied using Macdonald-Coelho model of electrode polarization. The combination of these two theoretical investigations of the experimental data emanating from one technique i.e. ac– impedance spectroscopy, predicts independently the contributions of the effect of mobile ion charges and ionic mobility to ion conduction mechanism.
In Chapter 5 focus shifts from polymer ion conductors to polymer mixed ion-electron conductor. The polymer mixed ion-electron conductor is demonstrated as a novel electrode material for Li-S battery. A simple strategy to overcome the challenges towards practical realization of a stable high performance Li–S battery is discussed. A soft mixed conducting polymeric network is utilized to configure sulphur nanoparticle. The soft matter network provides efficient and distinct pathways for lithium and electron conduction simultaneously. A lithiated polyethylene glycol (PEG) based surfactant tethered on ultra-small sulphur nanoparticles and wrapped up with polyaniline (PAni) (abbreviated as S-MIEC) is demonstrated here as an exceptional cathode for Li–S batteries. The S-MIEC is characterized by several methods: powder-X-ray diffraction (PXRD), thermo gravimetric analysis (TGA), fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), ac-impedance spectroscopy and dc current-voltage measurements are performed to evaluate conductivity of S-MIEC cathode. Electrochemical studies such as cyclic voltammetry, galvanostatic charge-discharge cycling, galvanostatic intermittent titration (GITT) are performed to demonstrate feasibility of S-MIEC in the Li–S battery performance.
Chapter 6 provides a brief summary of the work carried out as part of this thesis and also demonstrates the future perspective of the present work. Potential of the polymer physical network based gel polymer electrolytes, which are discussed in Chapter 2A-B for lithium-ion batteries, are demonstrated in Li-S battery. The proposed polymer physical network confines higher order lithium polysulfides (typically Li2S8) dissolved in tetraethylene glycol dimethyl ether (TEGDME) based electrolyte (TEGDME-1M LiTFSI). The three dimensional polymer network is proposed to be formed by physical blending of the poly(acrylonitrile) (PAN) with the copolymer of AN and poly(ethylene glycol) methyl ether methacrylate (PEGMA), [ P(AN–co–PEGMA)]. We extend here the similar synthetic approaches as described in Chapter 2A. The approach proposed and demonstrated in this concluding Chapter is expected to mitigate some of the major issues of Li-S chemistry. The proposed Li2S8 confined gel electrolyte exhibits moderately high values of ionic conductivity, 2 × 10-3 Ω-1cm-1 and shows a stable capacity of 350 mAhg-1 over 30 days in a separator free Li-S battery.
Libros sobre el tema "Electrochemical device systems"
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Sarkar, B. K. y Reena Singh. Hydrogen Fuel Cell Vehicles Current Status. Namya Press, 2022. http://dx.doi.org/10.56962/9789355451118.
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Abstract: The hazardous effects of pollutants from conventional fuel vehicles have caused the scientific world to move towards environmentally friendly energy sources. Though we have various renewable energy sources, the perfect one to use as an energy source for vehicles is hydrogen. Like electricity, hydrogen is an energy carrier that has the ability to deliver incredible amounts of energy. On-board hydrogen storage in vehicles is an important factor that should be considered when designing fuel cell vehicles. In this study, a recent development in hydrogen fuel cell engines is reviewed to scrutinize the feasibility of using hydrogen as a major fuel in transportation systems. A fuel cell is an electrochemical device that can produce electricity by allowing chemical gases and oxidants as reactants. With anodes and electrolytes, the fuel cell splits the cation and the anion in the reactant to produce electricity. Fuel cells use reactants, which are not harmful to the environment and produce water as a product of the chemical reaction. As hydrogen is one of the most efficient energy carriers, the fuel cell can produce direct current (DC) power to run the electric car. By integrating a hydrogen fuel cell with batteries and the control system with strategies, one can produce a sustainable hybrid car.
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Narlikar, A. V., ed. The Oxford Handbook of Small Superconductors. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.001.0001.
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This handbook examines cutting-edge developments in research and applications of small or mesoscopic superconductors, offering a glimpse of what might emerge as a giga world of nano superconductors. Contributors, who are eminent frontrunners in the field, share their insights on the current status and great promise of small superconductors in the theoretical, experimental, and technological spheres. They discuss the novel and intriguing features and theoretical underpinnings of the phenomenon of mesoscopic superconductivity, the latest fabrication methods and characterization tools, and the opportunities and challenges associated with technological advances. The book is organized into three parts. Part I deals with developments in basic research of small superconductors, including local-scale spectroscopic studies of vortex organization in such materials, Andreev reflection and related studies in low-dimensional superconducting systems, and research on surface and interface superconductivity. Part II covers the materials aspects of small superconductors, including mesoscopic effects in superconductor–ferromagnet hybrids, micromagnetic measurements on electrochemically grown mesoscopic superconductors, and magnetic flux avalanches in superconducting films with mesoscopic artificial patterns. Part III reviews the current progress in the device technology of small superconductors, focusing on superconducting spintronics and devices, barriers in Josephson junctions, hybrid superconducting devices based on quantum wires, superconducting nanodevices, superconducting quantum bits of information, and the use of nanoSQUIDs in the investigation of small magnetic systems.
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Cahay, M. Proceedings of the Fourth International Symposium on Quantum Confinement: Nanoscale Materials, Devices, and Systems (Proceedings / Electrochemical Society). Electrochemical Society, 1997.
Buscar texto completoCapítulos de libros sobre el tema "Electrochemical device systems"
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Gruszecki, Wiesław I. "Plant Photosystem II as an Example of a Natural Photovoltaic Device". En Electrochemical Processes in Biological Systems, 121–31. Hoboken, NJ: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118899076.ch6.
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Jyothis, Surendran, Ravindran Sujith y Sanket Goel. "Phosphorene-Based Electrochemical Systems". En Miniaturized Electrochemical Devices, 121–37. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/b23359-8.
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Tel-Vered, Ran, Bilha Willner y Itamar Willner. "Biohybrid Electrochemical Devices". En Electrochemistry of Functional Supramolecular Systems, 333–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470583463.ch12.
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Miserere, Sandrine y Arben Merkoçi. "Microfluidic Electrochemical Biosensors: Fabrication and Applications". En Lab-on-a-Chip Devices and Micro-Total Analysis Systems, 141–60. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08687-3_6.
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Arya, Anil y A. L. Sharma. "Hybrid Polymer Nanocomposites for Energy Storage/Conversion Devices: From Synthesis to Applications". En Electrochemical Energy Conversion and Storage Systems for Future Sustainability, 93–126. Includes bibliographical references and index.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9781003009320-3.
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Battistoni, Silvia. "Organic Memristive Devices and Organic Electrochemical Transistors as Promising Elements for Bio-inspired Systems". En Memristor Computing Systems, 273–95. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90582-8_12.
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Tsujii, Yoshinobu, Yohei Nakanishi, Ryohei Ishige, Kohji Ohno, Takashi Morinaga y Takaya Sato. "Development of Novel Nano-systems for Electrochemical Devices by Hierarchizing Concentrated Polymer Brushes". En Intelligent Nanosystems for Energy, Information and Biological Technologies, 195–215. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56429-4_11.
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Röpke, Wilfried, Alan O’Neill, Oliver Rötting, John Murrihy, Mila Pravda y Holger Becker. "Manufacturing Issues of Polymer Microfluidic Devices with Integrated Electrodes for Electrochemical Detection of Heavy Metals in Environmental Samples". En Micro Total Analysis Systems 2001, 183–84. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-1015-3_79.
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"Nanomaterial-Based Electrochemical Biosensors". En Nanomedical Device and Systems Design, 348–64. CRC Press, 2016. http://dx.doi.org/10.1201/b15626-18.
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Van Toan, Nguyen, Truong Thi Kim Tuoi, Nguyen Huu Trung, Khairul Fadzli Samat, Nguyen Van Hieu y Takahito Ono. "Micro-Thermoelectric Generators: Material Synthesis, Device Fabrication, and Application Demonstration". En Energy Recovery [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.102649.
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Micro-thermoelectric generator (TEG) possesses a great potential for powering wireless Internet of Things (IoT) sensing systems due to its capability of harvesting thermal energy into usable electricity. Herein, this work reviews the progress in recent studies on the micro-TEG, including material synthesis, device fabrication, and application demonstration. Thermoelectric materials are synthesized by the electrochemical deposition method. Three kinds of high-performance thermoelectric materials, including thick bulk-like thermoelectric material, Pt nanoparticles embedded in a thermoelectric material, and Ni-doped thermoelectric material, are presented. Besides the material synthesis, novel fabrication methods for micro-TEG can also help increase its output power and power density significantly. Two fabrication processes, micro/nano fabrication technology and assembly technology, are investigated to produce high-performance micro-TEG. Moreover, the fabircated micro-TEG as a power source for portable and wearable electronic devices has been demonstrated successfully.
Actas de conferencias sobre el tema "Electrochemical device systems"
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Po-Ying Li, Jason Shih, Ronalee Lo, Bonnie Adams, Rajat Agrawa, Saloomeh Saati, Mark S. Humayun, Yu-Chong Tai y Ellis Meng. "An electrochemical intraocular drug delivery device". En 2007 IEEE 20th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2007. http://dx.doi.org/10.1109/memsys.2007.4433047.
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Luo, Tao, Luyang Li, Vishal Ghorband, Yuanda Zhan, Hongjiang Song y Jennifer Blain Christen. "A portable impedance-based electrochemical measurement device". En 2016 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2016. http://dx.doi.org/10.1109/iscas.2016.7539197.
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Gurule, Anthony P. "Thermal Modeling of a Thermally Regenerative Electrochemical Device: AMTEC". En International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941435.
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Chakraborty, Isha, Ravi Akalkotkar, Dan Krueger, Tristram Coffin, Mochen Hu, Xiangyi Chen, Xingjian Gan, Swati Bhat, Linran Zhao y Yaoyao Jia. "A Wireless Trimodal Neural Interface Device with Electrical and Electrochemical Recording". En 2023 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS). IEEE, 2023. http://dx.doi.org/10.1109/wmcs58822.2023.10194259.
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Wei, Yi-Chi, Shin-Yu Su, Lung-Min Fu y Che-Hsin Lin. "Electrophoresis separation and electrochemical detection on a novel line-based microfluidic device". En 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2012. http://dx.doi.org/10.1109/memsys.2012.6170104.
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Park, Ho Seok, Jong Kyun You, Bong Gill Choi, Won Hi Hong y Ki-Pung Yoo. "1D and 3D Shaped Ionic Liquid/Aluminum Hydroxide Nanohybrids for Electrochemical Device". En 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2007. http://dx.doi.org/10.1109/nems.2007.352227.
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Idris, Razali, Anis Tasnim, Mas Rosemal Hakim, Dahlan Hj Mohd, Zulkafli Ghazali, Kamisah Mohamad Mahbor, L. T. Handoko y Masbah R. T. Siregar. "Epoxidised Natural Rubber Based Composite Polymer Electrolyte Systems For Use In Electrochemical Device Applications". En INTERNATIONAL WORKSHOP ON ADVANCED MATERIAL FOR NEW AND RENEWABLE ENERGY. AIP, 2009. http://dx.doi.org/10.1063/1.3243251.
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Zhang, Xingguo, Zhihua Pu, Xiaochen Lai, Haixia Yu y Dachao Li. "Flexible electrochemical film power supply with disposable glucose-based energy patch as a reconfigurable epidermal energy device". En 2018 IEEE Micro Electro Mechanical Systems (MEMS). IEEE, 2018. http://dx.doi.org/10.1109/memsys.2018.8346638.
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Sundaresan, Vishnu Baba, Ryan L. Harne, Travis Hery y Quanqi Dai. "A Nonlinear, Monolithic Structural-Material System for Vibration Energy Harvesting and Storage". En ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9304.
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This research introduces an integrated vibration energy harvester and electrochemical energy storage device that can effectively convert ambient vibrations directly into stored electrochemical energy. The electrochemical energy storage device is an electrical double layer capacitor (EDLC) with an ionic redox transistor as its membrane separator. This ‘smart’ membrane separator directly rectifies the electrical energy generated by the transduction from the nonlinear energy harvester, creating an ionic polarization across the membrane separator for storage. This electrochemical gradient can be subsequently used for powering sensor electronics as required in various applications, including structural condition monitoring. The alternating voltage developed by the energy harvester (+/−5V around 100 Hz) is connected to an aqueous supercapacitor fabricated from nanofibrous carbon paper electrodes and a polypyrrole-based (PPy(DBS)) smart membrane separator. A potential below −400mV from the energy harvester applied to the supercapacitor turns the smart membrane separator ‘ON’ and results in a unidirectional ionic current of Li+ ions. As the potential developed by the harvester cycles above ∼50 mV, the membrane separator switches ‘OFF’ and prevents the discharge of the rectified current. This leads to a continuous polarization of ions towards electrical fields relevant for powering electronics. This article is the first description and demonstration of an energy harvesting and storage system that can directly convert the electrical energy from a vibration energy harvester into electrochemical energy without the use of passive circuit components for power rectification.
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Shivakumar, Nair Siddharth, Manish Arora y Monto Mani. "A Proposed Design of an Universal Electrochemical Reader Based on a Collated Medical Device Innovation Framework and Systems Thinking". En 2018 Fourth International Conference on Biosignals, Images and Instrumentation (ICBSII). IEEE, 2018. http://dx.doi.org/10.1109/icbsii.2018.8524721.
Texto completoInformes sobre el tema "Electrochemical device systems"
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Delwiche, Michael, Boaz Zion, Robert BonDurant, Judith Rishpon, Ephraim Maltz y Miriam Rosenberg. Biosensors for On-Line Measurement of Reproductive Hormones and Milk Proteins to Improve Dairy Herd Management. United States Department of Agriculture, febrero de 2001. http://dx.doi.org/10.32747/2001.7573998.bard.
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The original objectives of this research project were to: (1) develop immunoassays, photometric sensors, and electrochemical sensors for real-time measurement of progesterone and estradiol in milk, (2) develop biosensors for measurement of caseins in milk, and (3) integrate and adapt these sensor technologies to create an automated electronic sensing system for operation in dairy parlors during milking. The overall direction of research was not changed, although the work was expanded to include other milk components such as urea and lactose. A second generation biosensor for on-line measurement of bovine progesterone was designed and tested. Anti-progesterone antibody was coated on small disks of nitrocellulose membrane, which were inserted in the reaction chamber prior to testing, and a real-time assay was developed. The biosensor was designed using micropumps and valves under computer control, and assayed fluid volumes on the order of 1 ml. An automated sampler was designed to draw a test volume of milk from the long milk tube using a 4-way pinch valve. The system could execute a measurement cycle in about 10 min. Progesterone could be measured at concentrations low enough to distinguish luteal-phase from follicular-phase cows. The potential of the sensor to detect actual ovulatory events was compared with standard methods of estrus detection, including human observation and an activity monitor. The biosensor correctly identified all ovulatory events during its testperiod, but the variability at low progesterone concentrations triggered some false positives. Direct on-line measurement and intelligent interpretation of reproductive hormone profiles offers the potential for substantial improvement in reproductive management. A simple potentiometric method for measurement of milk protein was developed and tested. The method was based on the fact that proteins bind iodine. When proteins are added to a solution of the redox couple iodine/iodide (I-I2), the concentration of free iodine is changed and, as a consequence, the potential between two electrodes immersed in the solution is changed. The method worked well with analytical casein solutions and accurately measured concentrations of analytical caseins added to fresh milk. When tested with actual milk samples, the correlation between the sensor readings and the reference lab results (of both total proteins and casein content) was inferior to that of analytical casein. A number of different technologies were explored for the analysis of milk urea, and a manometric technique was selected for the final design. In the new sensor, urea in the sample was hydrolyzed to ammonium and carbonate by the enzyme urease, and subsequent shaking of the sample with citric acid in a sealed cell allowed urea to be estimated as a change in partial pressure of carbon dioxide. The pressure change in the cell was measured with a miniature piezoresistive pressure sensor, and effects of background dissolved gases and vapor pressures were corrected for by repeating the measurement of pressure developed in the sample without the addition of urease. Results were accurate in the physiological range of milk, the assay was faster than the typical milking period, and no toxic reagents were required. A sampling device was designed and built to passively draw milk from the long milk tube in the parlor. An electrochemical sensor for lactose was developed starting with a three-cascaded-enzyme sensor, evolving into two enzymes and CO2[Fe (CN)6] as a mediator, and then into a microflow injection system using poly-osmium modified screen-printed electrodes. The sensor was designed to serve multiple milking positions, using a manifold valve, a sampling valve, and two pumps. Disposable screen-printed electrodes with enzymatic membranes were used. The sensor was optimized for electrode coating components, flow rate, pH, and sample size, and the results correlated well (r2= 0.967) with known lactose concentrations.