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Literatura académica sobre el tema "Electrode capacitive"

Autor: Grafiati

Publicado: 30 de noviembre de 2024

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Artículos de revistas sobre el tema "Electrode capacitive"

Asl, Sara Nazari, Frank Ludwig y Meinhard Schilling. "Noise properties of textile, capacitive EEG electrodes". Current Directions in Biomedical Engineering 1, n.º 1 (1 de septiembre de 2015): 34–37. http://dx.doi.org/10.1515/cdbme-2015-0009.

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AbstractThe rigid surface of the conventional PCB-based capacitive electrode produces an undefined distance between the skin and the electrode surface. Therefore, the capacitance introduced by them is uncertain and can vary from electrode to electrode due to their different positions on the scalp. However, textile electrodes which use conductive fabric as electrode surfaces, are bendable over the scalp. Therefore, it provides a certain value of the capacitance which is predictable and calculable accurately if the effective distance to the scalp surface can be determined. In this paper noise characteristics of textile electrodes with different fabric sizes as electrode’s surface and capacity calculations related to each size are presented to determine the effective distances for each electrode size.

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Wang, Li, Yun Zhou, Jie Wang y Ning Hu. "Approaching Capacitive Deionization (CDI) on Desalination of Water and Wastewater - New Progress and its Potential". Advanced Materials Research 1088 (febrero de 2015): 557–61. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.557.

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Capacitive deionization (CDI) technology is a challenge on an economical and effective electrosorption desalination method. The paper analyses the CDI current status and progress of carbon electrode materials, and describes the types of CDI and its performances of testing materials. The electrosorption capacities are summarized on the carbon electrode materials and the current hurdles. The reported numbers from the literature vary in a wide range between 0.25 and 26.42 mg/g of both electrodes CDI cell, we suggest that the CDI electrodes should have an adsorption of at least 9.0 mg/g NaCl when the applyed voltage is 2.0 V. The potential capacitive deionization technologies are proposed here.

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Wang, Zhiyu, Shun Wang, Guangyou Fang y Qunying Zhang. "Investigation on a Novel Capacitive Electrode for Geophysical Surveys". Journal of Sensors 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/4209850.

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Nonpolarizable electrodes are applied widely in the electric field measurement for geophysical surveys. However, there are two major problems: (1) systematic errors caused by poor electrical contact in the high resistive terrains and (2) environmental damage associated with using nonpolarizable electrodes. A new alternative structure of capacitive electrode, which is capable of sensing surface potential through weak capacitive coupling, is presented to solve the above problems. A technique is introduced to neutralize distributed capacitance and input capacitance of the detection circuit. With the capacitance neutralization technique, the transmission coefficient of capacitive electrode remains stable when environmental conditions change. The simulation and field test results indicate that the new capacitive electrode has an operating bandwidth range from 0.1 Hz to 1 kHz. The capacitive electrodes have a good prospect of the applications in geophysical prospecting, especially in resistive terrains.

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Suen, Min-Sheng y Rongshun Chen. "Capacitive Tactile Sensor with Concentric-Shape Electrodes for Three-Axial Force Measurement". Proceedings 2, n.º 13 (19 de diciembre de 2018): 708. http://dx.doi.org/10.3390/proceedings2130708.

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In this paper, a novel capacitive tactile sensing device has proposed and demonstrated to solve coupling problem within the normal force and shear force by the unique design of electrode shape. In addition, the tactile sensor was added in the measuring capability of torsion sensing compared with traditional capacitive sensor. The perceptive unit of tactile sensor, which was consist of five sensing electrodes to detect three-axial force. The complete tactile sensor composed of a top electrode, a bottom electrode, and a spacer layer. Each capacitive sensing unit comprised a pair of the concentric-shape but different size electrodes (top electrode and bottom electrode). In the future, the proposed tactile sensor can be utilized in the wearable devices, flexible interface, and bionic robotic skins.

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Tamura, Saki, Justin K. M. Wyss, Mirza Saquib Sarwar, Addie Bahi, John D. W. Madden y Frank K. Ko. "Woven Structure for Flexible Capacitive Pressure Sensors". MRS Advances 5, n.º 18-19 (2020): 1029–37. http://dx.doi.org/10.1557/adv.2020.136.

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AbstractFlexible and stretchable capacitive pressure sensors have been developed in recent years due to their potential applications in health monitoring, robot skins, body activity measurements and so on. In order to enhance sensor sensitivity, researchers have changed structure of the dielectric of parallel plate capacitive sensor . Here we enhance the sensor sensitivities by changing electrode composition and explore the use of a woven electrode structure sensor with silver coated nylon yarn and EcoflexTM. The woven structure enhanced sensitivity 2.3 times relative to a simple cross-grid geometry (sensitivity was 0.003 kPa-1). Furthermore, it is also observed that the sensor with the woven electrode also had better repeatability and showed less creep than a device using carbon black electrodes. The woven structure of the electrodes enabled the device to be compliant, despite the presence of the stiff nylon fibres – thereby enabling good sensitivity without the creep seen in softer electrodes.

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Gao, X., A. Omosebi, Z. Ma, F. Zhu, J. Landon, M. Ghorbanian, N. Kern y K. Liu. "Capacitive deionization using symmetric carbon electrode pairs". Environmental Science: Water Research & Technology 5, n.º 4 (2019): 660–71. http://dx.doi.org/10.1039/c8ew00957k.

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Laxman, Karthik, Laila Al Gharibi y Joydeep Dutta. "Capacitive deionization with asymmetric electrodes: Electrode capacitance vs electrode surface area". Electrochimica Acta 176 (septiembre de 2015): 420–25. http://dx.doi.org/10.1016/j.electacta.2015.07.036.

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Savchuk, Arsen. "Development of a model of electric impedance in the contact between the skin and a capacitive active electrode when measuring electrocardiogram in combustiology". Eastern-European Journal of Enterprise Technologies 2, n.º 5 (110) (30 de abril de 2021): 32–38. http://dx.doi.org/10.15587/1729-4061.2021.228735.

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Long-term ECG (electrocardiogram) measurement in patients with burns is a complicated problem since the overlapping of surface contact electrodes can lead to additional injuries. The possibility of ECG recording in patients with burns using capacitive electrodes was not proved, and there are no models of the electrode contact with a patient’s body while rehabilitation means are used. In this paper, the model of the contact between capacitive electrodes and the skin was modified and the circuit model of the contact: skin – bandages (saline solution) – film – active capacitive electrode, was described. The influence of the parameters of a capacitive electrode on the amplitude-frequency characteristics (AFC) of the contact of an electrode with skin was assessed. It was found that contact capacitance is crucial to obtain a high-quality ECG signal. The parameters of the impedance of bandages, saline solution, a dielectric film were calculated, and their effect on the AFC was studied. Based on the modified model, the AFC contact was modeled taking into consideration all the calculated parameters; it was found that the resulting AFC of the contact corresponds to the frequency range of the ECG signal. Analysis of the calculations proves the possibility of using capacitive electrodes when applying various rehabilitation means. It was found that at a change in the impedance of the saline solution from 0.1 gigaohms to 1 gigaohm, the changes in the AFC of the contact are not crucial for the final quality of the received signal. All calculations were carried out by modeling in the Qucs environment (ngspice SPICE). Simulation results can be used in the development of new types of capacitive electrocardiographic electrodes. The proposed model can be used to study other wound covers, as well as to model physiological processes when putting artificial skin and wound covers

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Tang, Yue, Ronghui Chang, Limin Zhang, Feng Yan, Haowen Ma y Xiaofeng Bu. "Electrode Humidification Design for Artifact Reduction in Capacitive ECG Measurements". Sensors 20, n.º 12 (18 de junio de 2020): 3449. http://dx.doi.org/10.3390/s20123449.

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For wearable capacitive electrocardiogram (ECG) acquisition, capacitive electrodes may cause severe motion artifacts due to the relatively large friction between the electrodes and the dielectrics. In some studies, water can effectively suppress motion artifacts, but these studies lack a complete analysis of how water can suppress motion artifacts. In this paper, the effect of water on charge decay of textile electrode is studied systematically, and an electrode controllable humidification design using ultrasonic atomization is proposed to suppress motion artifacts. Compared with the existing electrode humidification designs, the proposed electrode humidification design can be controlled by a program to suppress motion artifacts at different ambient humidity, and can be highly integrated for wearable application. Firstly, the charge decay mode of the textile electrode is given and it is found that the process of free water evaporation at an appropriate free water content can be the dominant way of triboelectric charge dissipation. Secondly, theoretical analysis and experiment verification both illustrate that water contained in electrodes can accelerate the decay of triboelectric charge through the free water evaporation path. Finally, a capacitive electrode controllable humidification design is proposed by applying integrated ultrasonic atomization to generate atomized drops and spray them onto textile electrodes to accelerate the decay of triboelectric charge and suppress motion artifacts. The performance of the proposed design is verified by the experiment results, which shows that the proposed design can effectively suppress motion artifacts and maintain the stability of signal quality at both low and high ambient humidity. The signal-to-noise ratio of the proposed design is 33.32 dB higher than that of the non-humidified design at 25% relative humidity and is 22.67 dB higher than that of non-humidified electrodes at 65% relative humidity.

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Park, Byoung-Nam. "Differential Analysis of Surface-Dominated vs. Bulk-Dominated Electrochemical Processes in Lithium Iron Phosphate Cathodes". Korean Journal of Metals and Materials 62, n.º 8 (5 de agosto de 2024): 624–30. http://dx.doi.org/10.3365/kjmm.2024.62.8.624.

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We employed electrophoretic deposition (EPD) using AC voltage to prepare lithium iron phosphate (LFP) Li-ion battery electrodes with varying the LFP thickness, to compare bulk-limited electro chemical reaction with the surface-limited electrochemical reactions. We analyzed the electrochemical performances of the thin and thick LFP electrodes at various scan rates. They revealed that with increasing scan rates, both electrode types showed a greater reliance on surface capacitive effects for charge storage. Significantly, the thin LFP electrode predominantly exhibited capacitive charge storage, surpassing diffusion-based storage mechanisms. This was in contrast to the performance of the thicker electrode, which had a lower capacitive contribution. Quantitative assessment using the Randles-Sevcik equation further confirmed the superior performance of the thin LFP electrode. The Li-ion diffusion coefficient of the thin LFP electrode was substantially higher (9.6×10-9 cm2·V-1·s-1) compared to the thick electrode (2.0×10-9 cm2·V-1·s-1), indicating enhanced ionic mobility in the surface-limited electrochemical reaction. These findings emphasize the significant advantages of thinner LFP electrodes, and induced surface limited electrochemical reaction, in high-rate applications, including higher capacitive charge storage and more favorable ion diffusion characteristics. The advantages conferred by the enhanced capacitive charge storage and superior ion diffusion in thin LFP electrodes have profound implications for the design and optimization of next-generation high-rate batteries. By focusing on tailoring electrode thickness, we can harness the full potential of surface-limited reactions, pushing the boundaries of what is currently achievable in terms of power density, charging speed, and cycle life in LFP-based energy storage technologies. These enhancements align with the growing need for high-performing, reliable energy storage solutions in an increasingly electrified and energy-conscious world.

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Tesis sobre el tema "Electrode capacitive"

Guldiken, Rasim Oytun. "Dual-electrode capacitive micromachined ultrasonic transducers for medical ultrasound applications". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31806.

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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Degertekin, F. Levent; Committee Member: Benkeser, Paul; Committee Member: Berhelot, Yves; Committee Member: Brand, Oliver; Committee Member: Hesketh, Peter. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Ge, Kangkang. "New insights on charge storage mechanism in carbon-based capacitive electrode". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES094.

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La compréhension de la formation et de la charge de la double couche électrique (EDL) des matériaux d'électrodes capacitives est cruciale pour développer les systèmes de stockage électrochimique de l'énergie de forte puissance, y compris en recharge. Cependant, les études expérimentales de la cinétique de charge des électrodes de carbone poreux, matériaux de choix pour les électrodes de supercondensateurs, posent d'importants défis en raison de la dynamique rapide des ions. Ce sont ces défis que nous proposons de relever dans ce travail. Dans un premier temps, nous nous sommes concentrés sur des carbones poreux de type CDC, c'est-à-dire des carbones dérivés de carbures (CDCs), et les avons caractérisés dans des électrolytes aqueux de différentes concentrations. En utilisant une micro-électrode à cavité, nous avons pu observer la déplétion de l'électrolyte lors de polarisations sous fortes surtensions, et avons analysé systématiquement son impact sur la cinétique de charge. Les résultats ont montré qu'une faible concentration d'électrolyte (10-3 M), une surtension élevée (> 200 mV) et une petite taille de pores de carbone (0,6 nm) exacerbent les gradients de concentration dans l'électrolyte, entraînant un transport ionique retardé. Dans un deuxième temps, nous avons étudié le mécanisme de stockage de charge dans un matériau de type oxyde de graphène réduit (rGO), toujours dans des électrolytes aqueux neutres. Les résultats de caractérisations électrochimiques operando par microbalance à quartz (EQCM) ont dépeint un mécanisme d'adsorption cationique en deux étapes : une adsorption de cations hydratés à faible surtension cathodique, suivie d'un mécanisme de déshydratation cationique pour des surtensions plus élevées (>200 mV). Notablement, une augmentation significative de la capacitance a été observée en raison de la déshydratation des cations, corrélée à une augmentation des interactions cation-rGO provenant de la charge de surface négative (potentiel zêta) du rGO. Ces résultats soulignent le rôle critique des interactions ion-électrode et de la désolvatation des cations dans les mécanismes de stockage de charge. Dans la dernière partie de cette thèse, nous avons caractérisé des matériaux de type réseaux métallo-organiques (MOFs) conducteurs lamellaires comme matériaux d'électrode. Des mesures par EQCM ont montré que le mécanisme de stockage de la charge dans ces MOFs en électrolyte non aqueux est dominé par l'adsorption des cations. Lorsque des cations de petites tailles sont utilisés (type tetraethylammonium), la capacité s'en trouve augmentée, tandis que l'utilisation de cations plus volumineux (tetrabutyl, hexyl) conduisent à une saturation des pores des électrodes MOF, entraînant une dynamique de charge plus lente avec une hystérésis, entraînant un déplacement important des molécules de solvant. Les résultats de cette thèse ont permis de développer notre compréhension de du transport et de l'adsorption ionique dans les milieux confinés, et du rôle de la dynamique des solvants, posant les bases pour concevoir des matériaux optimisés pour le stockage de l'énergie capacitive
Understanding the formation and structure of the electrical double layer (EDL) in state-of-the-art capacitive electrode materials is crucial for preparing the next-generation of fast charging and high-power energy storage systems. However, experimental investigations of the charging kinetics of porous carbon electrodes, the materials of choice for electrochemical capacitors, pose significant challenges due to rapid ion dynamics; this is the challenge we want to address in this work. This thesis starts with a focus on carbide-derived porous carbon (CDC), employing chronoamperometry in electrolytes of varying concentrations. Using a cavity micro-electrode setup, we were able to observe electrolyte depletion and we systematically analyzed its impacts on charging the kinetics. Results indicated that for low electrolyte concentration (10-3 M), high overpotential (> 200 mV), and small carbon pore size (0.6 nm) exacerbated electrolyte depletion, slowing down ion transportation. Then, we further investigated the charge storage mechanism in reduced graphene oxide (rGO) electrodes in near-neutral aqueous electrolytes. Operando EQCM results depicted a two-step cation adsorption mechanism with i) initial hydrated cation adsorption at low overpotential followed by cation dehydration for higher overvoltage(>200 mV). Notably, a significant increase in capacitance was observed due to cation dehydration, with the degree of enhancement correlating with non-electrostatic cation-rGO interactions due the negative charge of the rGO surface (zeta potential). These findings underscore the critical role of ion-electrode interactions and cation desolvation in modulating the charge storage mechanisms and capacitance. In a last part, we used conductive layered metal-organic frameworks (MOFs) as electrode materials. These MOFs revealed a cation-dominated charge storage mechanism in non-aqueous electrolytes via EQCM measurements. The use of small size cations (tetraethylammonium) resulted in improved capacity, while larger cations (butyl, hexyl ammonium) saturated MOF electrode pores, leading to asymmetric and sluggish charging dynamics, forcing solvent molecules to participate in the charge storage mechanism under nanopore confinement. The discoveries of this thesis significantly advance our understanding of ion electrosorption, ion transportation, and the role of solvent dynamics in confined pores, thus guiding the design of materials with improved performance for capacitive energy storage devices

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Dehkhoda, Amir Mehdi. "Development and characterization of activated biochar as electrode material for capacitive deionization". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57838.

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Biochar, a by-product of biomass pyrolysis, was investigated as a carbon-based electrode material for a water treatment method based on electrostatic adsorption/desorption of ions in electric double layers (EDLs) formed on the charged electrodes (capacitive deionization, CDI). Surface area, porous structure, and functional groups of biochar were developed, and corresponding effects on EDL capacitive performance were studied. A novel method was explored to tailor the micro- and meso-porous structures of activated biochar by exploiting the interaction between pre-carbonization drying conditions and carbonization temperature (475–1000 C) in a thermo-chemical process (KOH chemical activation). The mechanism of porosity development was investigated; results suggest that the conversion of KOH to K₂CO₃ under different drying conditions has a major role in tailoring the structure. The resultant surface area, micro- and meso-pore volumes were: 488–2670 m² g-¹, 0.04–0.72 cm³ g-¹, and 0.05–1.70 cm³ g-¹, respectively. Tailored biochar samples were investigated using physico-chemical surface characterization and electrochemical methods. For electrochemical testing, activated biochar was sprayed onto Ni mesh current collectors using Nafion® as binder. The majorly microporous activated biochar showed promising capacitances between 220 and 245 F g-¹ when 0.1 mol L-¹ NaCl/NaOH was used as the electrolyte. Addition of mesoporous structure resulted in significantly reduced electrode resistance (up to 80%) and improved capacitive behaviour due to enhanced ion transport within the pores. CDI of NaCl and ZnCl₂ solutions was investigated in a batch-mode unit through the use of tailored biochar electrodes. For NaCl removal, all samples showed promising capacity (up to 5.13 mg NaCl g-¹) and durability through four consecutive cycles. In contrast, in the case of ZnCl₂, the microporous sample showed a considerable drop in removal capacity (>75%) from cycle 1 to 4, whereas the combined micro- and mesoporous sample exhibited relatively small electrosorption capacity. Interestingly, the sample with mostly mesoporous structure has shown the highest removal capacity (1.15 mg ZnCl₂ g-¹) and durability for Zn²⁺ removal. These results emphasize the importance of tailoring the porous structure of biochar as a function of the specific size of adsorbate ions to improve the CDI performance.
Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate

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Hamer, Tyler Thomas. "Electrode arrays, test fixture, and system concept for high-bandwidth capacitive imaging". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108921.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 147-151).
Spot defects are a leading source of failure in the fabrication of integrated circuits (ICs). Thus, the IC industry inspects for defects at multiple stages of IC fabrication, especially the fabrication of IC photomasks. However, existing non-invasive imaging methods cannot image a modern photomask in a reasonable time-frame. Electroquasistatic (EQS) sensors are arrays of electrode pairs that capacitively couple to targets they sweep over. Utilizing high measurement frequencies and a number of parallel scanning electrode pairs, EQS sensors have been suggested as a potential high speed alternative for defect detection in IC fabrication. This thesis continues the investigation into EQS sensors for high speed imaging by exploring EQS sensors driven with high excitation frequencies. We develop electrode arrays that can be driven with high excitation frequencies and construct high frequency EQS sensors by attaching them to high frequency drive electronics. We also fabricate a test fixture for positioning these sensors relative to and sweeping them across targets on a conductive base. As the sensors sweep across targets, their impedance is measured from 1 - 500 MHz using an impedance analyzer and is later converted into the capacitance between the sensor's electrode array and the target. Capacitance changes are produced by a variable air gap and by a dielectric step, confirming these sensors can detect changes in a target's geometric and material properties with high excitation frequencies. Finally, we present concepts for a high speed measurement system which utilizes these sensors.
by Tyler Thomas Hamer.
S.M.
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering

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Rommerskirchen, Alexandra Klara Elisabeth [Verfasser], Matthias [Akademischer Betreuer] Wessling y Matthias [Akademischer Betreuer] Franzreb. "Continuous flow-electrode capacitive deionization / Alexandra Klara Elisabeth Rommerskirchen ; Matthias Wessling, Matthias Franzreb". Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1231911719/34.

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King, Harrison Raymond. "Electrode Geometry Effects in an Electrothermal Plasma Microthruster". DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1899.

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Nanosatellites, such as Cubesats, are a rapidly growing sector of the space industry. Their popularity stems from their low development cost, short development cycle, and the widespread availability of COTS subsystems. Budget-conscious spacecraft designers are working to expand the range of missions that can be accomplished with nanosatellites, and a key area of development fueling this expansion is the creation of micropropulsion systems. One such system, originally developed at the Australian National University (ANU), is an electrothermal plasma thruster known as Pocket Rocket (PR). This device heats neutral propellant gas by exposing it to a Capacitively Coupled Plasma (CCP), then expels the heated gas to produce thrust. Significant work has gone towards understanding how PR creates and sustains a plasma and how this plasma heats the neutral gas. However, no research has been published on varying in the device's geometry. This thesis aims to observe how the size of the RF electrode affects PR operation, and to determine if it can be adjusted to improve performance. To this end, a thruster has been built which allows the geometry of the RF electrode to be easily varied. Measurements of the plasma density at the exit of this thruster with different sizes of electrode were then used to validate a Computational Fluid Dynamics (CFD) model capable of approximately reproducing experimental measurements from both this study and from the ANU team. From this CFD, the number of argon ions in the thruster was found for each geometry, since collisions between argon ions and neutrals are primarily responsible for the heating observed in the thruster. A geometry using a 10.5 mm electrode was observed to produce a 23% increase in the quantity of ions produced compared to the baseline 5 mm electrode size, and a 3.5 mm electrode appears to produce 88% more ions.

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Wu, Nan. "Capacitive reverse electrodialysis cells for osmotic energy harvesting : Toward real brines and power enhancement". Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLS019.

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Face aux problèmes de réchauffement climatique, trouver des ressources énergétiques propres et durables pour remplacer les combustibles fossiles conventionnels est d'une importance capitale. L'énergie osmotique demeure une ressource énergétique inexploitée avec un potentiel significatif. Dans ce travail, nous parvenons à une conversion efficace de l'énergie osmotique en électricité grâce à un processus de mélange bien contrôlé utilisant un système d'électrodialyse inverse capacitif (CRED). Il est démontré qu'un écart substantiel de densité de puissance existe entre le système CRED et la valeur maximale théorique, principalement en raison de l'efficacité de conversion faible du flux ionique-électronique dans les électrodes capacitifs. Pour pallier cette limitation, nous proposons la stratégie de boosting pour optimiser le régime de fonctionnement du système CRED. Des expériences et des modélisations confirment une amélioration de la performance énergétique du système CRED. Pour avancer vers des applications réelles, nous évaluons les performances du système CRED sous des solutions composées de mélanges ioniques complexes. Contrairement à la chute significative de la densité de puissance observée dans les systèmes RED classiques, le système CRED ne présente qu'une légère diminution lorsqu'il est soumis à des solutions avec un mélange d'ions divalents. Ce phénomène est attribué au renversement périodique des solutions dans les compartiments, qui atténue l'effet d'empoisonnement de la membrane. Ce résultat est ensuite validé par des tests à long terme avec des solutions réelles. Pour généraliser le système CRED dans un spectre plus large, nous proposons une cellule de gradient de pH avec des électrodes de MnO2 à pseudo-capacité. Elle utilise l'énergie osmotique établie dans un processus de capture de CO2 basé sur un électrolyte et vise à réduire le coût global du processus de capture de carbone. La cellule de gradient de pH présente une augmentation inattendue de la densité de puissance sous la stratégie de boosting. Cela est dû à la contribution de tension supplémentaire des électrodes en raison du changement de couverture fractionnelle lié aux réactions d'oxydoréduction. Cependant, elle reste dans le cadre du régime capacitif et est bien décrite par une modélisation CRED adaptée
Given the global warming issues, finding clean and sustainable energy resources to replace conventional fossil fuels is of paramount importance. Osmotic energy remains an untapped energy resource with significant potential. In this work, we achieve efficient conversion of osmotic energy into electricity through a well-controlled mixing process using a capacitive reverse electrodialysis (CRED) system. It is demonstrated that a substantial power density gap exists between the CRED system and the theoretical maximum value, primarily due to the low ionic-electronic flux conversion efficiency in capacitive electrodes. To address this limitation, we propose the boosting strategy to optimize the working regime of the CRED system. Both experiments and modeling confirm an enhanced energy performance of the CRED system. To advance towards real-world applications, we assess the performance of the CRED system under solutions composed of complex ion mixing. In contrast to the significant power density drop observed in classic RED systems, the CRED system exhibits only a minor decrease when subjected to solutions with divalent ion mixing. This phenomenon is attributed to the periodic water chamber reversal, which mitigates the membrane poisoning effect. This result is further validated through long-term testing with real-world solutions. To generalize the CRED system into a broader spectrum, we propose a pH gradient cell with MnO2 electrodes of pseudo capacitance. It uses the osmotic energy established within an electrolyte based CO2 capturing process and aims to reduce the overall cost of carbon capturing process. The pH gradient cell presents unexpected power density increase under boosting strategy. This is due to the additional electrode voltage contribution due to fractional coverage change related to redox reactions. However, it stays in the framework of capacitive regime and remains well described by an adapted CRED modeling

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Smith, Nafeesah. "Development of capacitive deionisation electrodes: optimization of fabrication methods and composition". University of the Western Cape, 2020. http://hdl.handle.net/11394/7710.

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>Magister Scientiae - MSc
Membrane Capacitive Deionisation (MCDI) is a technology used to desalinate water where a potential is applied to an electrode made of carbonaceous materials resulting in ion adsorption. Processes and materials for the production of electrodes to be applied in Membrane Capacitive Deionisation processes were investigated. The optimal electrode composition and synthesis approached was determined through analysis of the salt removal capacity and the rate at which the electrodes absorb and desorb ions. To determine the conductivity of these electrodes, the four point probe method was used. Contact angle measurements were performed to determine the hydrophilic nature of the electrodes. N2 adsorption was done in order to determine the surface area of carbonaceous materials as well as electrodes fabricated in this study. Scanning electron microscopy was utilised to investigate the morphology. Electrodes were produced with a range of research variables; (i) three different methods; slurry infiltration by calendaring, infiltration ink dropwise and spray-coating, (ii) electrodes with two different active material/binder ratios and a constant conductive additive ratio were produced in order to find the optimum, (iii) two different commercially available activated carbon materials were used in this study (YP50F and YP80F), (iv) two different commercially available electrode substrates were utilised (JNT45 and SGDL), (v) different slurry mixing times were investigated showing the importance of mixing, and (vi) samples were treated at three different temperatures to establish the optimal drying conditions. Through optimization of the various parameters, the maximum adsorption capacity of the electrode was incrementally increased by 36 %, from 16 mg·g-1 at the start of the thesis to 25 mg·g-1 at the end of the study.

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Oh, Yoontaek. "Effects of Electrochemical Reactions on Sustainable Power Generation from Salinity Gradients using Capacitive Reverse Electrodialysis". University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin161375277977973.

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Brahmi, Youcef. "Nouveau concept pour améliorer l'extraction d'énergie bleue par des couches capacitives". Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLS099.

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Pour lutter efficacement contre le réchauffement climatique, il est nécessaire d'augmenter la production d'énergies propres et renouvelables. L'énergie solaire, l'énergie éolienne, l’hydroélectrique et l'énergie marémotrice sont des technologies matures. L'augmentation de la production d'énergie renouvelable nécessite l'utilisation de sources d'énergie peu ou pas exploitées, comme l’énergie bleue. Cette forme d’énergie correspond à l’énergie générée lors du mélange d'eau douce et d'eau salée. Cependant, les procédés actuels d’extraction d'énergie à partir de gradients de sel restent inefficaces, principalement parce que les membranes sélectives commerciales sont peu performantes comme le cas de l’électrodialyse inverse ou l’Osmose à pression retardée qui ne sont toujours pas économiquement rentable. Les espoirs de membranes non sélectives dotées de canaux nanofluidiques chargés qui ont été conçus pour réduire la résistance interne de la cellule semblent être vains. Une nouvelle solution est proposée qui consiste à augmenter le potentiel de circuit ouvert de la membrane en y attachant des électrodes capacitives avec des groupements fonctionnels chargés négativement qui permet l’adsorption des ions, essentiellement les ions positifs. Une telle configuration nous permet de doubler le potentiel du circuit ouvert de la cellule sans trop modifier la résistance ohmique globale et donc de multiplier par 4 la puissance brute potentiellement récupérable.Après une étude approfondie réalisée dans le but de caractériser le procédé et une optimisation de la consommation énergique due aux pertes de charge, nous présentons un dispositif de quelques centimètres carrés avec une seule membrane récoltant une densité de puissance nette de 2 Watts par mètre carré de membrane (densité de puissance potentielle nette estimée à 5.4 W.m-2, ce qui rend le système économiquement viable
To effectively combat global warming, it is necessary to increase the production of clean, renewable energy. Solar, wind power, hydroelectric dams and tidal power plants are mature technologies. Increasing the production of this energy requires the use of energy sources that are little or not exploited like the blue energy which is the a less-known source with enormous potential that can be generated directly from the mixing of fresh and salt water. However, current processes for energy harvesting from salt gradients remain inefficient mainly because commercial selective membranes have poor performance as in the reverse electrodialysis or in the pressure retarded osmosis and still not economically viable. Hopes for nonselective membranes with charged nanofluidic channels which have been designed to reduce the internal resistance of the cell seem to be in vain. Here we present a novel solution that involves increasing the open circuit potential of the membrane by attaching tailored capacitive layers with negatively charged functional groups on the surface that adsorb ions, mainly the positive ones. Such a configuration allows us to double the potential of the open circuit of the cell without modifying too much the global ohmic resistance and thus to multiply by 4 the potentially recoverable power.After a thorough study carried out in order to characterize the process and an optimization of the energy consumption caused by the hydraulic pressure drop, we display a device of a few squared centimeters with only one membrane harvesting a net power density of 2 Watts per square meter of the membrane (estimated net potential power density 5.4 W.m−2 ) which makes the system economically viable

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Libros sobre el tema "Electrode capacitive"

Ali, Abdalla H. Electrode heating sample vaporization in capacitively coupled microwave plasma atomic emission spectrometry. 1991.

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Magee, Patrick y Mark Tooley. Measurement and monitoring in anaesthesia. Editado por Antony R. Wilkes y Jonathan G. Hardman. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199642045.003.0025.

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This chapter introduces some basic physical principles that contribute to the function of various monitors used in anaesthetic practice. Topics include biological signal processing, operational amplifiers, including single-ended amplifiers, and the benefit of patient-isolated differential amplifiers; it includes filtering, digital processing, and electrodes. The generic principles of transducers are introduced, including resistive, capacitive, and inductance strain gauges used in transducers, photoelectric, piezoelectric, and chemical transducers, calibration of transducers, and the significance of resonance and damping in measurement systems. Since both are widely used in monitoring systems, there is an introduction to spectroscopy and magnetism.

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Jacobs, Jonathan D., ed. Introduction. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198796572.003.0001.

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Causal powers are ubiquitous. Electrons are negatively charged; they have the power to repel other electrons. Water is a solvent; it has the power to dissolve salt. Rocks are hard; they have the power to break windows. We use concepts of causal powers and their relatives—dispositions, capacities, abilities, and so on—to describe the world around us, both in everyday life and in scientific practice. But what is it about the world that makes such descriptions apt? While most philosophers agree it is appropriate to use causal power concepts to describe the world, there is substantive disagreement about what it is that makes it appropriate.

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Capítulos de libros sobre el tema "Electrode capacitive"

Gray, Tony. "Electrode Patterns". En Projected Capacitive Touch, 69–79. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98392-9_8.

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Toan, Nguyen Van y Takahito Ono. "Capacitive Silicon Resonators with Movable Electrode Structures". En Capacitive Silicon Resonators, 125–40. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2019. http://dx.doi.org/10.1201/9780429266010-10.

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Senapati, Mukut y Partha Pratim Sahu. "Modelling and Simulation of a Patch Electrode Multilayered Capacitive Sensor". En Lecture Notes in Computer Science, 554–60. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34872-4_61.

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Takahashi, S. y A. Ueno. "Non-obtrusive Monitoring of Narrow-Band Electrocardiogram with a Capacitive Electrode Unit during Sleep". En IFMBE Proceedings, 812–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03885-3_225.

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Balduf, Torsten, Gérard Valentin y François Lapicque. "Electrochemistry in a Packed-Bed Electrode of Activated Carbon Particles: An Investigation of Faradaic and Capacitive Processes". En Electrochemical Engineering and Energy, 101–8. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2514-1_11.

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Xu, Chenxuan, Xu Qian, Xingxing Gu y Junjie Yang. "Influence of Water Molecules on the Interfacial Structures and Energy Storage Behavior of Ionic Liquid Electrolytes". En Lecture Notes in Civil Engineering, 591–97. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-9184-2_48.

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AbstractIonic liquids have been considered as promising electrolytes for supercapacitors due to the wide electrochemical stability window. However, water molecules inevitably damage the electrochemical properties of ionic liquids due to the hygroscopic property. This paper reveals the effect of water molecules on the interfacial structure and energy storage performance of ionic liquids using the atomistic simulations. Unlike neat ionic liquids, the Helmholtz region for humid ionic liquids is mainly composed of BMI cations and water molecules. Importantly, water molecules primarily accumulate in the buffer region between BMI cation and graphene electrode, especially at the high negative charges, which is the crucial factor to induce the hydrogen evolution reactions for the decreased electrochemical stability window. More interestingly, the dielectric properties of water molecules in the buffer layer are beneficial for lowering the electric potentials for higher capacitive performance. The differential capacitance of [BMI+][BF4−]/H2O electrolyte exhibits a bell-shaped curve with a maximum value of ~5.0 F/cm2 at 0.75 V. The revealed insights are important for understanding the water effect in ionic liquid-based supercapacitor energy storage.

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Ghafar-Zadeh, Ebrahim y Mohamad Sawan. "Capacitive Sensing Electrodes". En CMOS Capacitive Sensors for Lab-on-Chip Applications, 25–33. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3727-5_2.

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Ping, Zhou, Li Zhoucheng, Wang Feng y Jiao Hongyu. "Non-contact ECG Monitoring Based on Capacitive Electrodes". En IFMBE Proceedings, 1506–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29305-4_396.

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Babusiak, B., M. Gála, Marek Penhaker, Marek Cerny y J. Kraus. "Indirect-Contact Surface Electrocardiography Measurements by Capacitive Electrodes". En IFMBE Proceedings, 663–66. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02913-9_169.

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N’Diaye, Jeanne, Raunaq Bagchi, Jingbo Liu y Keryn Lian. "Organic-Carbon Composites for Next Generation Capacitive Electrodes". En ACS Symposium Series, 83–115. Washington, DC: American Chemical Society, 2022. http://dx.doi.org/10.1021/bk-2022-1421.ch003.

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Actas de conferencias sobre el tema "Electrode capacitive"

Wang, L., P. Hartmann, Z. Donko, Y. H. Song y J. Schulze. "Plasma uniformity control in capacitive RF discharges through electrode customization". En 2024 IEEE International Conference on Plasma Science (ICOPS), 1. IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10627082.

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Xuwei, Xiong. "Enhanced Sensitivity in Capacitive Pressure Sensors via Sawtooth Electrode Design". En 2024 IEEE 2nd International Conference on Image Processing and Computer Applications (ICIPCA), 981–86. IEEE, 2024. http://dx.doi.org/10.1109/icipca61593.2024.10709211.

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Abdullahi, Salami Ifedapo, Mohamed Hadi Habaebi y Noreha Abdul Malik. "Capacitive Electrode Sensor:Design and Testing". En 2018 7th International Conference on Computer and Communication Engineering (ICCCE). IEEE, 2018. http://dx.doi.org/10.1109/iccce.2018.8539287.

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Zangl, H. "B2.2 - Electrode Design for Capacitive Sensors". En SENSOR+TEST Conferences 2011. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2011. http://dx.doi.org/10.5162/sensor11/b2.2.

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Shqau, Krenar y Amy Heintz. "Mixed Ionic Electronic Conductors for Improved Charge Transport in Electrotherapeutic Devices". En 2017 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dmd2017-3454.

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Electrotherapeutic devices require an electrode for coupling with the body. The most common electrodes are made of conducting corrosion resistance materials (e.g., TiN, Ir-IrO2, Pt) plus a coupling layer (e.g., electrolyte). The electrode is the location where redox reaction take place between the device and the tissue. As such, it must conduct both electrons and ions. The reactions can be capacitive, involving the charging and discharging of the electrode-electrolyte double layer, or faradaic. Capacitive charge-injection is more desirable than faradic charge-injection because no chemical species are created or consumed during a stimulation pulse. Most noble metal based electrodes are faradic or pseudo-capacitive, which can lead to performance changes over time. In addition, under the high rate of charge injection and high current density conditions of a neuromuscular stimulation pulse, access to all the accessible charges is limited by the interfacial resistance and low surface area at the electrode [1]. A particularly critical point is the passage of current between the surface of the skin and the electrical contact connected by wire to the device, which requires a low stable resistance that does not vary with time, humidity [2]. We have developed new hybrid mixed-ionic-electronic conductors (MIECs) that have the potential to overcome these deficiencies. The MIECs are an interconnected network of electrical and ionic conductors in an elastomeric matrix that provide: (1) high surface area for efficient capacitive charge-discharge; (2) high ionic conductivity for low interfacial resistance; (3) low ohmic resistance; and (4) excellent flexibility and toughness. Carbon nanotubes (CNTs) are the electrical conductors in the MIEC and hyaluronic acid (HA), along with moisture and ions, is the ionic conductor. Unlike the current state-of-the-art, conducting noble metals, this system exhibits good mechanical properties, high conductivity (up to 3000 mS/cm), high moisture retention (up to 100wt%) and high ion mobility, leading to facile electrode kinetics. This simple yet efficient system is promising for the fabrication of a variety of high performance flexible electrodes.

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Purohit, Shubham, Yash Agrawal, Bakul Gohel, Vinay Palaparthy y Rutu Parekh. "Capacitive Electrode Based Single Lead ECG Detection". En 2021 8th International Conference on Signal Processing and Integrated Networks (SPIN). IEEE, 2021. http://dx.doi.org/10.1109/spin52536.2021.9566104.

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Chen, Yin Sheng, Tai-Jui Wang, Hsien Wei Chiu y Yue-Der Lin. "Capactive EMG Measurement with Passive Capacitive Electrode". En 2022 IEEE 22nd International Conference on Bioinformatics and Bioengineering (BIBE). IEEE, 2022. http://dx.doi.org/10.1109/bibe55377.2022.00082.

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Chen, Chi-Chun, Wen-Ying Chang y Ting Yi Xie. "Shielded capacitive electrode with high noise immunity". En 2017 IEEE International Conference on Consumer Electronics - Taiwan (ICCE-TW). IEEE, 2017. http://dx.doi.org/10.1109/icce-china.2017.7991043.

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Abdollahi-Mamoudan, Farima, Sebastien Savard, Clemente Ibarra-Castanedo, Tobin Filleter y Xavier Maldague. "Coplanar Capacitive Sensing as a New Electromagnetic Technique for Non-Destructive Evaluation". En 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/qnde2021-74739.

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Abstract Coplanar capacitive technique is a relatively novel electro-magnetic Non-Destructive Testing (NDT) method that could be applied to the evaluation of materials by moving a set of electrodes on the surface of the specimen. In addition to the design-related parameters such as electrode shape, size, and the separation distance between the main electrodes, the material of the specimen affects the coplanar capacitive probe performance. In this paper, a 3D Finite Element Modeling (FEM) was employed to assess and identify the electric field behaviour as a function of material under test for non-conducting and conducting specimens with/without defect. Physical experiments were carried out by a pair of rectangular coplanar electrodes on an aluminium specimen with surface defects covered by a 5 mm thick plexiglass insulation layer to verify the simulation results and evaluate the performance of the probe. A good qualitative agreement was observed between the numerical simulations and experimental results.

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Wartzek, Tobias, Hannes Weber, Marian Walter, Benjamin Eilebrecht y Steffen Leonhardt. "Automatic electrode selection in unobtrusive capacitive ECG measurements". En 2012 25th IEEE International Symposium on Computer-Based Medical Systems (CBMS). IEEE, 2012. http://dx.doi.org/10.1109/cbms.2012.6266314.

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Informes sobre el tema "Electrode capacitive"

Ceron, M. y S. Hawks. A Review: Flow Electrode Capacitive Deionization for Improved Electrochemical Water Desalination. Office of Scientific and Technical Information (OSTI), agosto de 2022. http://dx.doi.org/10.2172/1964004.

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Bhandarkar, A., M. R. Ceron, P. G. Campbell, S. Hawks y C. Loeb. Effects of Pore Size on Na/Ca Ion Selectivity Using Flow Through Electrode Capacitive Deionization. Office of Scientific and Technical Information (OSTI), julio de 2019. http://dx.doi.org/10.2172/1568013.

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Tran, Tri y John Kennedy. Study Of Carbon Aerogel Electrode Material For Capacitive Deionization: Final Report CRADA No. TC-1509-97. Office of Scientific and Technical Information (OSTI), febrero de 2001. http://dx.doi.org/10.2172/1410066.

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Tran, T. Study Of Carbon Aerogel Electrode Material For Capacitive Deionization: Final Report CRADA No. TC-1509-97. Office of Scientific and Technical Information (OSTI), febrero de 2001. http://dx.doi.org/10.2172/790087.

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Farmer, J. C., D. V. Fix, G. V. Mack, R. W. Pekala y J. F. Poco. Capacitive, deionization with carbon aerogel electrodes: Carbonate, sulfate, and phosphate. Office of Scientific and Technical Information (OSTI), julio de 1995. http://dx.doi.org/10.2172/125000.

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Farmer, J. C., D. V. Fix, G. V. Mack, R. W. Pekala y J. F. Poco. The use of capacitive deionization with carbon aerogel electrodes to remove inorganic contaminants from water. Office of Scientific and Technical Information (OSTI), febrero de 1995. http://dx.doi.org/10.2172/80970.

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