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Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "HYBRID ELECTROCHEMICAL"

1

Wu, Jing, Xun Zhou, Han Xing Liu, Zhi Dong Lin, and Gao Feng Chen. "Synthesis and Electrochemical Performances of Electroactive Nano Layered Organic-Inorganic Perovskite Containing Trivalent Iron Ion." Materials Science Forum 688 (June 2011): 307–13. http://dx.doi.org/10.4028/www.scientific.net/msf.688.307.

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Анотація:
A steady layered organic-inorganic perovskite hybrid containing Fe3+ was prepared in the air with phenosafranine as organic sheets, the Fe(CN)63- as inorganic sheets. We utilized the Fe(CN)63- as inorganic sheets of perovskite hybrids, which may help to stabilize the unusual metal-deficient layered structures. The results of X-ray diffractometry (XRD) and scanning electron microscopy (SEM) show that the hybrid is typical layered perovskite structure. The hybrid was mixed with paraffin to form a hybrid paste for the hybrid paste electrode. Electrochemical characteristics of carbon paste electrode (CPE) modified by hybrid were investigated with cyclic voltammetry. The modified electrode can accelerate the electron-transfer to improve the electrochemical reaction reversibility and be use for the determination of chemicals. The interactions between sodium nitrite (NaNO2), sodium bromide (NaBr), hydroxylammonium chloride (NH2OH·HCl), hydroquinone (C6H6O2) with hybrid were studied. The modified electrode exhibits good electrochemical activity. The hybrid can be used as electrochemical materials.
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2

Zheng, Yuhong, Da Wang, Xiaolong Li, Ziyang Wang, Qingwei Zhou, Li Fu, Yunlong Yin, and David Creech. "Biometric Identification of Taxodium spp. and Their Hybrid Progenies by Electrochemical Fingerprints." Biosensors 11, no. 10 (October 18, 2021): 403. http://dx.doi.org/10.3390/bios11100403.

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Анотація:
The use of electrochemical fingerprints for plant identification is an emerging application in biosensors. In this work, Taxodium ascendens, T. distichum, T. mucronatum, and 18 of their hybrid progenies were collected for this purpose. This is the first attempt to use electrochemical fingerprinting for the identification of plant hybrid progeny. Electrochemical fingerprinting in the leaves of Taxodium spp. was recorded under two conditions. The results showed that the electrochemical fingerprints of each species and progeny possessed very suitable reproducibility. These electrochemical fingerprints represent the electrochemical behavior of electrochemically active substances in leaf tissues under specific conditions. Since these species and progenies are very closely related to each other, it is challenging to identify them directly using a particular electrochemical fingerprinting. Therefore, electrochemical fingerprints measured under different conditions were used to perform pattern recognition. We can identify different species and progenies by locating the features in different pattern maps. We also performed a phylogenetic study with data from electrochemical fingerprinting. The results proved that the electrochemical classification results and the relationship between them are closely related.
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3

Watson, Keith J., Jin Zhu, SonBinh T. Nguyen, and Chad A. Mirkin. "Redox-active polymer-nanoparticle hybrid materials." Pure and Applied Chemistry 72, no. 1-2 (January 1, 2000): 67–72. http://dx.doi.org/10.1351/pac200072010067.

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Анотація:
Ring-opening metathesis polymerization was used to modify organic soluble gold nanoparticles with redox-active polymers. A gel-permeation chromatography study revealed that each nanoparticle is modified with approximately 11 polymer chains. Electrochemical studies of nanoparticles modified with block copolymers of two different redox-active groups revealed that each monomer is electrochemically accessible, while no current rectification was observed.
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4

Kolkovskyi, P. I., B. K. Ostafiychuk, M. I. Kolkovskyi, N. Ya Ivanichok, S.-V. S. Sklepova, and B. I. Rachiy. "Mechanisms of charge accumulation in electrochemical systems formed based on of nanoporous carbon and manganese oxide." Physics and Chemistry of Solid State 21, no. 4 (December 30, 2020): 621–27. http://dx.doi.org/10.15330/pcss.21.4.621-627.

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Анотація:
In this work, the processes occurring in electrochemical systems based on nanoporous carbon material and manganese oxide in an aqueous solution of lithium sulfate are analyzed. Furthermore, it is shows the feasibility of these materials combination cycling as electrodes of a hybrid electrochemical capacitor. The combination of electrode materials with different mechanisms of charge accumulation was determined. Consequently, an increase in the accumulated energy by more than 25% by the formation of an electric double layer and the occurrence of redox reactions based on carbon and manganese oxide respectively. The laboratory sample of an aqueous electrolyte hybrid electrochemical capacitor was formed. Moreover, the laboratory sample is electrochemically stable at an operating voltage of 2 V.
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5

Berestovskyi, D., and N. P. Hung. "Hybrid Fabrication of Stainless Steel Channels for Microfluidic Application." Advanced Materials Research 1115 (July 2015): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.33.

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Анотація:
This research develops a hybrid micromanufacturing technique by combining micromilling and electrochemical micropolishing to fabricate extremely smooth surface finish, high aspect ratio, and complex microchannel patterns. Milling with coated and uncoated ball-end micromills in minimum quantity lubrication is used to remove most materials to define a channel pattern. The milled channels are then electrochemically polished to required finish. A theoretical model accurately predicts surface finish in meso-scale milling, but not in micro-scale milling due to size effect. Electrochemical polishing using an acid-based electrolyte is applied to repeatedly produce stainless steel microchannels with average surface finish of 100 nm when measuring across grain boundaries and 10 nm within a single grain.
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6

Moyseowicz, Adam, Krzysztof Pająk, Katarzyna Gajewska, and Grażyna Gryglewicz. "Synthesis of Polypyrrole/Reduced Graphene Oxide Hybrids via Hydrothermal Treatment for Energy Storage Applications." Materials 13, no. 10 (May 15, 2020): 2273. http://dx.doi.org/10.3390/ma13102273.

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Анотація:
Herein, we propose hydrothermal treatment as a facile and environmentally friendly approach for the synthesis of polypyrrole/reduced graphene oxide hybrids. A series of self-assembled hybrid materials with different component mass ratios of conductive polymer to graphene oxide was prepared. The morphology, porous structure, chemical composition and electrochemical performance of the synthesized hybrids as electrode materials for supercapacitors were investigated. Nitrogen sorption analysis at 77 K revealed significant changes in the textural development of the synthesized materials, presenting specific surface areas ranging from 25 to 199 m2 g−1. The combination of the pseudocapacitive polypyrrole and robust graphene material resulted in hybrids with excellent electrochemical properties, which achieved specific capacitances as high as 198 F g−1 at a current density of 20 A g−1 and retained up to 92% of their initial capacitance after 3000 charge–discharge cycles. We found that a suitable morphology and chemical composition are key factors that determine the electrochemical properties of polypyrrole/reduced graphene oxide hybrid materials.
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7

Zhou, Yuqing, Weijin Qian, Weijun Huang, Boyang Liu, Hao Lin, and Changkun Dong. "Carbon Nanotube-Graphene Hybrid Electrodes with Enhanced Thermo-Electrochemical Cell Properties." Nanomaterials 9, no. 10 (October 12, 2019): 1450. http://dx.doi.org/10.3390/nano9101450.

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Анотація:
Carbon nanotube-Graphene (CNT-Gr) hybrids were prepared on stainless steel substrates by the electrophoretic deposition (EPD) to make the thermo-electrochemical cell (TEC) electrodes. The as-obtained TEC electrodes were investigated by the SEM, XRD, Raman spectroscopy, tensile, and surface resistance tests. These hybrid electrodes exhibited significant improved TEC performances compared to the pristine CNT electrode. In addition, these hybrid electrodes could be optimized by tuning the contents of the graphene in the hybrids, and the CNT-Gr-0.1 hybrid electrode showed the best TEC performance with the current density of 62.8 A·m−2 and the power density of 1.15 W·m−2, 30.4% higher than the CNT electrode. The enhanced TEC performance is attributed to improvements in the electrical and thermal conductivities, as well as the adhesion between the CNT-Gr hybrid and the substrate. Meanwhile, the relative conversion efficiency of the TECs can reach 1.35%. The investigation suggests that the growth of CNT-Gr hybrid electrodes by the EPD technique may offer a promising approach for practical applications of the carbon nanomaterial-based TEC electrodes.
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Soto, Dayana, and Jahir Orozco. "Hybrid Nanobioengineered Nanomaterial-Based Electrochemical Biosensors." Molecules 27, no. 12 (June 15, 2022): 3841. http://dx.doi.org/10.3390/molecules27123841.

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Анотація:
Nanoengineering biosensors have become more precise and sophisticated, raising the demand for highly sensitive architectures to monitor target analytes at extremely low concentrations often required, for example, for biomedical applications. We review recent advances in functional nanomaterials, mainly based on novel organic-inorganic hybrids with enhanced electro-physicochemical properties toward fulfilling this need. In this context, this review classifies some recently engineered organic-inorganic metallic-, silicon-, carbonaceous-, and polymeric-nanomaterials and describes their structural properties and features when incorporated into biosensing systems. It further shows the latest advances in ultrasensitive electrochemical biosensors engineered from such innovative nanomaterials highlighting their advantages concerning the concomitant constituents acting alone, fulfilling the gap from other reviews in the literature. Finally, it mentioned the limitations and opportunities of hybrid nanomaterials from the point of view of current nanotechnology and future considerations for advancing their use in enhanced electrochemical platforms.
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Blaudeck, Thomas, Peter Andersson Ersman, Mats Sandberg, Sebastian Heinz, Ari Laiho, Jiang Liu, Isak Engquist, Magnus Berggren, and Reinhard R. Baumann. "Hybrid manufacturing of electrochemical transistors." NIP & Digital Fabrication Conference 27, no. 1 (January 1, 2011): 189–92. http://dx.doi.org/10.2352/issn.2169-4451.2011.27.1.art00048_1.

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Xu, Dan, Ruiyi Li, Guangli Wang, Haiyan Zhu, and Zaijun Li. "Electrochemical detection of carbendazim in strawberry based on a ruthenium–graphene quantum dot hybrid with a three-dimensional network structure and Schottky heterojunction." New Journal of Chemistry 45, no. 45 (2021): 21308–14. http://dx.doi.org/10.1039/d1nj04602k.

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Анотація:
The hybrid of a metal with graphene can improve electrochemical properties, but present hybrids cannot break through the limitations of their inherent properties because metals and graphene are conductors.
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Дисертації з теми "HYBRID ELECTROCHEMICAL"

1

Agrawal, Richa. "Hybrid Electrochemical Capacitors: Materials, Optimization, and Miniaturization." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3680.

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Анотація:
With the ever-advancing technology, there is an incessant need for reliable electrochemical energy storage (EES) components that can provide desired energy and power. At the forefront of EES systems are electrochemical capacitors (ECs), also known as supercapacitors that typically have higher power and superior cycle longevity but lower energy densities than their battery counterparts. One of the routes to achieve higher energy density for ECs is using the hybrid EC configuration, which typically utilizes a redox electrode coupled with a counter double-layer type electrode. In this dissertation, both scale-up (coin-cell type) as well as scale-down (on-chip miniaturized) hybrid ECs were designed, constructed and evaluated. The first part of the dissertation comprised material identification, syntheses, and electrochemical analyses. Lithium titanate-anatase titanium oxide (Li4Ti5O12-TiO2) composites were synthesized via electrostatic spray deposition (ESD) and characterized in both half-cell and full-cell assembly against lithium and nanostructured carbon based counter electrodes, respectively. The second redox type material studied for hybrid electrochemical capacitors was ESD derived manganese oxide (MnOx). The MnOx electrodes exhibited a high gravimetric capacitance of 225F g-1 in aqueous media. Further improvement in the rate handling of the MnOx electrodes was achieved by using CNT additives. The MnOx-CNT composites were tested in full-cell assembly against activated carbon counter electrodes and tested for different anode and cathode mass ratios in order to achieve the best energy-power tradeoff, which was the second major goal of the dissertation. The optimized hybrid capacitor was able to deliver a high specific energy density of 30.3 Wh kg-1 and a maximal power density of 4kW kg-1. The last part of the dissertation focused on a scale-down miniaturized hybrid microsupercapacitor; an interdigitated electrode design was adopted in order to shorten the ion-transport pathway, and MnOx and reduced graphene oxide (rGO) were chosen as the redox and double layer components, respectively. The hybrid microsupercapacitor was able to deliver a high stack energy density of 1.02 mWh cm-3 and a maximal stack power density of 3.44 W cm-3, both of which are comparable with thin-film batteries and commercial supercapacitor in terms of volumetric energy and power densities.
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2

Fu, Xuewei. "Graphene-V2O5 Hybrid Aerogels As Electrode Materials For Electrochemical Capacitors." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1430499247.

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3

Syed, Khurram Raza. "Electrochemical generation of hydrogen." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/13813.

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Анотація:
Global warming and the energy crisis are two of the greatest challenges on which mankind is currently focused. This has forced governments and other organisations to think how to protect the environment and how to reduce fuel costs. A variety of new and exciting technologies are being investigated to address the energy problem. Alternative energy sources such as solar power, fuel cells, wind power and tidal waves are active areas of commercial and scientific pursuit. A major area of current research is moving towards the hydrogen economy and hydrogen based energy systems. Hydrogen can be produced in many ways, most commonly by steam reforming of hydrocarbon (70% to 85% thermal efficiency) but the downside is that it releases carbon mono oxide (CO)), compared with commercial PEM electrolysers where performance has been reported to be 56 -73% at normal temperature pressure(NTP) with zero carbon emission. Electrochemical production of hydrogen has several advantages: (i) It gives pure hydrogen. (ii) It allows portability (e.g. Solar energy could be used to power the electrochemical cell). (iii) It can be produced on demand. The generation of Hydrogen via electrolysis has been the subject of many studies over the last two hundred years. However, there is still room for further work to improve both the efficiency of the process and methods of storage of the gas. The cleanest method at present is to produce hydrogen by electrolysis, and the main focus of this research is to design and develop such a green energy fuel cell for on-demand application. The aim of the work presented in this thesis was to further investigate the electrolysis method for hydrogen production. An Electrochemical fuel cell contains a minimum of two electrodes: the positively charged electrode called the anode where oxygen bubble will form, and the second negatively charged electrode called the cathode, where hydrogen bubbles will form during a chemical reaction caused by applying electrical current between these electrode. The project was initiated with the objective of finding a low cost solution for on-demand hydrogen generation. To establish a starting point, the first cell (cell-1) design was based on the work of Stephen Barrie Chambers (see chapter 3) to check the performance levels. The fabrication of the cell-1 design resulted in a mixture of hydrogen and oxygen in the same chamber, which means the cell-1 design, has a possible fire and explosion hazard. The device also has the drawback of lower performance of hydrogen production; columbic efficiency is between 40% to 46% at 1 amp to 3 amp current in 30% KOH alkaline solution. However, the advantage of reproducing Stephen’s innovation is that it allowed a quick and deep understanding of hydrogen generation. This thesis presents recent work on the fabrication of low cost electrolysis cells containing continuous flow alkaline (KOH, up to 30%) electrolyte using low cost electrodes (stainless steel 316) and membranes based on ultrahigh molecular weight polyethylene (UHMW PE) to produce hydrogen without the hazard of fire and explosion. In this research an On-Demand Hydrogen Generation cell-3 achieved a 95% hydrogen generation coulombic efficiency, which is about 49% efficiency improvement as compared to the stainless steel electrode, and was 22% better than the nano structured electrode. The typical cell voltage is 2.5 V at current flow ranging from 30 to 120 mA cm-2 in 30% KOH electrolyte. The achievement here of such high efficiencies paves the way for more research in the areas of space management, electrode surface structure and flow control (based on the application requirement). This invention can be used for aeronautic, marine and automotive application as well as in many other areas.
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4

Meera, P. "Nafion based hybrid polymer electrolytes and nanocomposites: design and electrochemical investigations." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2009. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2726.

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5

Djelad, Halima. "Syntesis of hybrid silica-organic materials for the development of electrochemical biosensing applications." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/101152.

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6

Kanakaraj, Sathya Narayan. "Processing Carbon Nanotube Fibers for Wearable Electrochemical Devices." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573224577754985.

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7

Klett, Matilda. "Electrochemical Studies of Aging in Lithium-Ion Batteries." Doctoral thesis, KTH, Tillämpad elektrokemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145057.

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Анотація:
Lithium-ion batteries are today finding use in automobiles aiming at reducing fuel consumption and emissions within transportation. The requirements on batteries used in vehicles are high regarding performance and lifetime, and a better understanding of the interior processes that dictate energy and power capabilities is a key to strategic development. This thesis concerns aging in lithium-ion cells using electrochemical tools to characterize electrode and electrolyte properties that affect performance and performance loss in the cells.   A central difficulty regarding battery aging is to manage the coupled effects of temperature and cycling conditions on the various degradation processes that determine the lifetime of a cell. In this thesis, post-mortem analyses on harvested electrode samples from small pouch cells and larger cylindrical cells aged under different conditions form the basis of aging evaluation. The characterization is focused on electrochemical impedance spectroscopy (EIS) measurements and physics-based EIS modeling supported by several material characterization techniques to investigate degradation in terms of properties that directly affect performance. The results suggest that increased temperature alter electrode degradation and limitations relate in several cases to electrolyte transport. Variations in electrode properties sampled from different locations in the cylindrical cells show that temperature and current distributions from cycling cause uneven material utilization and aging, in several dimensions. The correlation between cell performance and localized utilization/degradation is an important aspect in meeting the challenges of battery aging in vehicle applications.   The use of in-situ nuclear magnetic resonance (NMR) imaging to directly capture the development of concentration gradients in a battery electrolyte during operation is successfully demonstrated. The salt diffusion coefficient and transport number for a sample electrolyte are obtained from Li+ concentration profiles using a physics-based mass-transport model. The method allows visualization of performance limitations and can be a useful tool in the study of electrochemical systems.

QC 20140512

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8

Carretero, González Nina Magali. "Iridium oxide-carbon hybrid materials as electrodes for neural systems. Electrochemical synthesis and characterization." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283440.

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Анотація:
El desarrollo de interfaces neuronales requiere el uso de nuevos materiales electroactivos y biocompatibles, que al aplicar campos eléctricos no causen efectos secundarios que pueden dañar los tejidos o degradar la funcionalidad del electrodo. A día de hoy, existen diferentes materiales electroactivos que se usan como electrodos en el sistema nervioso: oro, platino, carbón, Pt-Ir o IrOx entre otros, siendo este último el que ha mostrado superiores resultados. Una alta eficiencia electroquímica, estabilidad en condiciones biológicas y biocompatibilidad, han hecho del IrOx el material más prometedor como electrodo para estimulación y registro de señales neuronales. Sin embargo, los avances tecnológicos han generado una demanda de nuevos materiales con propiedades mejoradas y con menos inconvenientes que los actuales (bajos valores de capacidad de carga o la rigidez inherente de este tipo de óxidos, ya que presentan poca compatibilidad con los tejidos blandos). Estas mejoras se pueden conseguir con el uso de materiales híbridos, que unan las diferentes propiedades de los componentes. En este sentido, se han preparado electroquímicamente híbridos IrOx-CNTs, con propiedades mejoradas tras la adicción de nanotubos de carbono. La composición química de estos híbridos es muy parecida a la obtenida para IrOx, aunque la incorporación de nanotubos de carbono hace la superficie más rugosa, aumentando de esta manera el área superficial del material. Estas propiedades, junto con el aumento de la conductividad proporcionada por los nanotubos de carbono, tienen como consecuencia elevados valores de capacidad de carga electroquímica. También, la estabilidad de las capas resultantes mejora en comparación con las muestras de IrOx. Las pruebas de biocompatibilidad realizadas a las muestras IrOx-CNTs han mostrado una alta supervivencia y funcionalidad neural, parecida a la obtenida con IrOx o borosilicato (usado como referencia). Estos datos, validan este tipo de nuevos materiales como prometedores electrodos neurales. También se han preparado híbridos de IrOx con grafito y grafeno. En ambas capas, se ha observado la presencia de partículas de carbón, aunque la presencia de grafeno de única lámina no ha podido ser confirmada, y serán necesarios más experimentos. Las propiedades electroquímicas de estos híbridos, IrOx-grafito e IrOx-grafeno, son similares a las obtenidas para IrOx-CNTs, pero con mayores valores de capacidad de carga. Sin embargo, la estabilidad electroquímica es pobre para el híbrido de grafito, y finalmente la capa se despega, debido presuntamente, a la estructura heterogénea de los híbridos de grafito, en la cual, grandes partículas de carbón no están completamente introducidas en la matriz del IrOx. Híbridos de IrOx con grafeno dopado con nitrógeno se han preparado también, mostrando buenas propiedades y altos valores de capacidad de carga y estabilidad, incluso comparados con los resultados obtenidos para los híbridos con grafeno no dopado. El aumento de la conductividad en estos materiales se puede deber a la presencia de nitrógeno, que induce el aumento de defectos en las láminas de grafeno. La biocompatibilidad de estos materiales híbridos grafíticos está siendo estudiada. Tri-híbridos poliméricos también han sido sintetizados electroquímicamente, IrOx-PEDOT-CNTs. El uso de una matríz polimérica, ofrece más flexibilidad al futuro electrodo, lo que es deseable para aplicaciones en tejidos blandos. Sin embargo, los primeros resultados obtenidos muestran que el polímero encapsula los nanotubos de carbono y el IrOx, minimizando sus propiedades electroquímicas. Como consecuencia, la conducta electroquímica del material híbrido es muy similar a la obtenida en otros polímeros, como PEDOT-PSS. Las pruebas de biocompatibilidad para estos híbridos poliméricos muestran baja viabilidad neuronal, aunque un nuevo modelo de co-cultivos (astrocitos-neuronas) se ha propuesto para mejorar la biocompatibilidad en este tipo de materiales. Los materiales obtenidos en todos los casos, son capas bien adheridas, lo que permite su futuro uso como electrodos o substratos de crecimiento neuronal.
The development of neural interfaces requires new electroactive and biocompatible materials, capable to apply electric fields without secondary effects, as large impedances at the interface or radical formation, which can cause damage in the tissues and the degradation of the electrode functionality. Currently, different types of electroactive materials are available for application as electrodes in the neural system: gold, platinum, glassy carbon, Pt-Ir, TiN or IrOx, among others, being the last, the one with superior performance. Properties such as high electrochemical efficiencies, good bio-stability and significant biocompatibility, have turned out IrOx into one of the most promising material for neural recording and stimulation electrodes. However, new technological breakthroughs have generated a demand of novel materials, with enhanced properties and which also minimize the drawbacks found in the actual ones, as low stability under electrochemical conditions, small values for charge capacity or the inherent rigidity of these oxides, which involves low compatibility with soft tissues. These improvements required may be achieved by hybrid materials, which join different properties from both counterparts. In this sense, IrOx-CNTs have been electrochemically prepared with enhanced properties. The chemical composition at the surface is very similar to that for IrOx, but the incorporation of carbon nanotubes makes the surface rougher, increasing the available interface area of the material. These properties, joined with the conductivity provided by the CNTs, yield very high values for charge storage capacity in electrochemical measurements. Also, the stability of the resulting coatings is improved in comparison with bare IrOx. The biocompatibility tests have shown high cellular survival and neuron functionality, similar to those values obtained for bare IrOx or borosilicate (used for reference), which validates these new materials as promising neural electrodes. IrOx hybrids with graphite and graphene also have been prepared. In both coatings, the presence of carbon particles has been demonstrated, although the confirmation of graphene sheets instead of few-layered graphene needs more experimental studies. The electrochemical properties of these IrOx-graphene and IrOx-graphite hybrids are similar than those obtained for IrOx-CNTs electrodes, with high values of charge storage capacity. However, the stability during consecutive cycling for the graphite-hybrid is poor and the coating is finally delaminated. These results are presumably due to heterogeneous structure in graphite-hybrids, in which the big carbon particles are not completely embedded in the IrOx matrix. Also, IrOx hybrids with N-doped graphene have been prepared, showing promising properties and very high values for charge storage capacity and stability, even when compared with non-doped IrOx-graphene coatings. The enhanced conductivity of these materials can be related with the presence of nitrogen, which induces the increase of the defects in the graphene sheets. The biocompatibility of these graphitic materials is under study. Polymeric tri-hibrids, IrOx-PEDOT-CNTs, have been also electrochemically synthesized. The use of a polymeric matrix is an effort to confer more flexibility to the electrode, which is desirable for soft tissue applications. However, the first results show that the polymer may encapsulate the CNTs and the IrOx particles, minimizing the electrochemical properties of these species. As a consequence, the electrochemical performance of the hybrid material is similar to those obtained for other polymers, as PEDOT-PSS. The biocompatibility tests have shown low neuronal viability in these substrates; however, co-cultures have been proposed as a novel method to improve biocompatibility in these types of materials. The materials obtained in all cases, are well adehered coatings, which leads to an easy future perpespective for their use as electrodes or cells substrates.
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SECHI, ELISA. "Development and characterization of nanoporous and hybrid materials through electrochemical techniques for energetic applications." Doctoral thesis, Università degli Studi di Cagliari, 2017. http://hdl.handle.net/11584/249611.

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Анотація:
This PhD project, focused on the achievement of nanoporous and hybrid materials, is divided in two main topics: the first one is the synthesis of nanoporous nickel electrodes through electrochemical dealloying; the second one is the preparation of polyaniline/porous silicon hybrid materials by aniline electropolymerization on n-type porous silicon surface. Both materials have been synthetized and characterized by electrochemical methods in order to study the effect of the parameters of preparation on their properties. A particular attention was pointed out on the photoactivity and catalytic behavior. The main results show that porous nickel can be obtained by selective etching of copper from Ni-Cu deposits, under pulsed voltage conditions. The highest values of surfaces have been obtained adopting a low ratio between the corrosion and relaxation time. These surfaces result fully exploitable for the hydrogen and oxygen evolution reactions, as well as for photoelectrochemical applications. Concerning the porous silicon, the results show that an improved photoactivity can be achieved by electropolymerization of polyaniline, using the electroreduction of diazonium salt as underlayer. The hybrid samples present a higher photocurrent with respect to unmodified porous silicon, from the visible to the near-infrared region. Depending on the electrochemical conditions adopted for the synthesis, an increase in photocurrent more than one order of magnitude has been founded.
This PhD project, focused on the achievement of nanoporous and hybrid materials, is divided in two main topics: the first one is the synthesis of nanoporous nickel electrodes through electrochemical dealloying; the second one is the preparation of polyaniline/porous silicon hybrid materials by aniline electropolymerization on n-type porous silicon surface. Both materials have been synthetized and characterized by electrochemical methods in order to study the effect of the parameters of preparation on their properties. A particular attention was pointed out on the photoactivity and catalytic behavior. The main results show that porous nickel can be obtained by selective etching of copper from Ni-Cu deposits, under pulsed voltage conditions. The highest values of surfaces have been obtained adopting a low ratio between the corrosion and relaxation time. These surfaces result fully exploitable for the hydrogen and oxygen evolution reactions, as well as for photoelectrochemical applications. Concerning the porous silicon, the results show that an improved photoactivity can be achieved by electropolymerization of polyaniline, using the electroreduction of diazonium salt as underlayer. The hybrid samples present a higher photocurrent with respect to unmodified porous silicon, from the visible to the near-infrared region. Depending on the electrochemical conditions adopted for the synthesis, an increase in photocurrent more than one order of magnitude has been founded.
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10

Chandrasekaran, Rajeswari. "Modeling of electrochemical energy storage and energy conversion devices." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37292.

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Анотація:
With increasing interest in energy storage and conversion devices for automobile applications, the necessity to understand and predict life behavior of rechargeable batteries, PEM fuel cells and super capacitors is paramount. These electrochemical devices are most beneficial when used in hybrid configurations rather than as individual components because no single device can meet both range and power requirements to effectively replace internal combustion engines for automobile applications. A system model helps us to understand the interactions between components and enables us to determine the response of the system as a whole. However, system models that are available predict just the performance and neglect degradation. In the first part of the thesis, a framework is provided to account for the durability phenomena that are prevalent in fuel cells and batteries in a hybrid system. Toward this end, the methodology for development of surrogate models is provided, and Pt catalyst dissolution in PEMFCs is used as an example to demonstrate the approach. Surrogate models are more easily integrated into higher level system models than the detailed physics-based models. As an illustration, the effects of changes in control strategies and power management approaches in mitigating platinum instability in fuel cells are reported. A system model that includes a fuel cell stack, a storage battery, power-sharing algorithm, and dc/dc converter has been developed; and preliminary results have been presented. These results show that platinum stability can be improved with only a small impact on system efficiency. Thus, this research will elucidate the importance of degradation issues in system design and optimization as opposed to just initial performance metrics. In the second part of the thesis, modeling of silicon negative electrodes for lithium ion batteries is done at both particle level and cell level. The dependence of the open-circuit potential curve on the state of charge in lithium insertion electrodes is usually measured at equilibrium conditions. Firstly, for modeling of lithium-silicon electrodes at room temperature, the use of a pseudo-thermodynamic potential vs. composition curve based on metastable amorphous phase transitions with path dependence is proposed. Volume changes during lithium insertion/de-insertion in single silicon electrode particle under potentiodynamic control are modeled and compared with experimental data to provide justification for the same. This work stresses the need for experiments for accurate determination of transfer coefficients and the exchange current density before reasoning kinetic hysteresis for the potential gap in Li-Si system. The silicon electrode particle model enables one to analyze the influence of diffusion in the solid phase, particle size, and kinetic parameters without interference from other components in a practical porous electrode. Concentration profiles within the silicon electrode particle under galvanostatic control are investigated. Sluggish kinetics is established from cyclic voltammograms at different scan rates. Need for accurate determination of exchange current density for lithium insertion in silicon nanoparticles is discussed. This model and knowledge thereof can be used in cell-sandwich model for the design of practical lithium ion cells with composite silicon negative electrodes. Secondly, galvanostatic charge and discharge of a silicon composite electrode/separator/ lithium foil is modeled using porous electrode theory and concentrated solution theory. Porosity changes arising due to large volume changes in the silicon electrode with lithium insertion and de-insertion are included and analyzed. The concept of reservoir is introduced for lithium ion cells to accommodate the displaced electrolyte. Influence of initial porosity and thickness of the electrode on utilization at different rates is quantitatively discussed. Knowledge from these studies will guide design of better silicon negative electrodes to be used in dual lithium insertion cells for practical applications.
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Книги з теми "HYBRID ELECTROCHEMICAL"

1

Chilton, J. E. Hybrid fiber-optic-electrochemical carbon monoxide monitor. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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2

Chilton, J. E. Hybrid fiber-optic-electrochemical carbon monoxide monitor. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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3

R, Carpenter C., ed. Hybrid fiber-optic-electrochemical carbon monoxide monitor. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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4

Chilton, J. E. Hybrid fiber-optic-electrochemical carbon monoxide monitor. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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5

R, Carpenter C., ed. Hybrid fiber-optic-electrochemical carbon monoxide monitor. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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6

Feric, Tony Gordon. Thermal, Structural and Transport Behaviors of Nanoparticle Organic Hybrid Materials Enabling the Integrated Capture and Electrochemical Conversion of Carbon Dioxide. [New York, N.Y.?]: [publisher not identified], 2022.

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7

(Editor), Ralph J. Brodd, Daniel H. Doughty (Editor), K. Naoi (Editor), M. Morita (Editor), C. Nanjundiah (Editor), J. H. Kim (Editor), and G. Nagasubramanian (Editor), eds. Advances in Electrochemical Capacitors and Hybrid Power Systems. Electrochemical Society, 2002.

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8

Metal-Organic Frameworks-Based Hybrid Materials for Environmental Sensing and Monitoring. Taylor & Francis Group, 2022.

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9

Bilal, Muhammad, Tuán Anh Nguyen, Ram K. Gupta, and Tahir Rasheed. Metal-Organic Frameworks-Based Hybrid Materials for Environmental Sensing and Monitoring. Taylor & Francis Group, 2022.

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10

Bilal, Muhammad, Tuán Anh Nguyen, Ram K. Gupta, and Tahir Rasheed. Metal-Organic Frameworks-based Hybrid Materials for Environmental Sensing and Monitoring. Taylor & Francis Group, 2022.

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Частини книг з теми "HYBRID ELECTROCHEMICAL"

1

Péra, Marie-Cécile, Daniel Hissel, Hamid Gualous, and Christophe Turpin. "Hybrid Electrical System." In Electrochemical Components, 277–308. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118576892.ch6.

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2

Kumar, Kaushik, Divya Zindani, and J. Paulo Davim. "Hybrid Electrochemical Process." In Materials Forming, Machining and Tribology, 153–66. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76075-9_10.

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3

Gupta, Kapil, Neelesh K. Jain, and R. F. Laubscher. "Electrochemical Hybrid Machining Processes." In Hybrid Machining Processes, 9–32. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25922-2_2.

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4

Naoi, Katsuhiko. "Electrochemical Supercapacitors electrochemical supercapacitors and Hybrid Systems hybrid systems." In Encyclopedia of Sustainability Science and Technology, 3426–43. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_501.

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5

Zhao, Yu, Lele Peng, and Guihua Yu. "Electrochemical Hierarchical Composites." In Hybrid and Hierarchical Composite Materials, 239–86. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12868-9_7.

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6

Sharma, Vyom, Mahavir Singh, and Janakarajan Ramkumar. "Electrochemical Spark Machining Process." In Electric Discharge Hybrid-Machining Processes, 45–69. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003202301-3.

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7

Naoi, Katsuhiko. "Electrochemical Supercapacitors and Hybrid Systems." In Batteries for Sustainability, 93–115. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5791-6_4.

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8

Sharma, Arun Dutt, and Rupinder Singh. "A Framework on Electrochemical Machining of ABS-15% Al Composite." In Additive, Subtractive, and Hybrid Technologies, 107–13. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99569-0_9.

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9

Arka, Girija Nandan, Shashi Bhushan Prasad, and Subhash Singh. "Electrochemical Discharge Machining for Hybrid Polymer Matrix Composites." In Fabrication and Machining of Advanced Materials and Composites, 139–57. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003327370-8.

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10

Brinker, Manuel, Tobias Krekeler, and Patrick Huber. "Electrochemical Actuation of a Nanoporous Polypyrrole Hybrid Material." In Album of Porous Media, 14. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_5.

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Тези доповідей конференцій з теми "HYBRID ELECTROCHEMICAL"

1

Inal, Sahika. "Organic electrochemical transistors for biosensing." In Organic and Hybrid Sensors and Bioelectronics XIV, edited by Ruth Shinar, Ioannis Kymissis, and Emil J. List-Kratochvil. SPIE, 2021. http://dx.doi.org/10.1117/12.2595771.

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2

Nguyen, Thuc-Quyen. "Novel materials for organic electrochemical transistors." In Organic and Hybrid Field-Effect Transistors XX, edited by Oana D. Jurchescu and Iain McCulloch. SPIE, 2021. http://dx.doi.org/10.1117/12.2597204.

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3

Gerasimov, Jennifer, Arnab Halder, Mathieu Linares, Chiara Musumeci, Sarbani Ghosh, Deyu Tu, Tobias Abrahamsson, et al. "Evolvable organic electrochemical transistors (Conference Presentation)." In Organic and Hybrid Sensors and Bioelectronics XV, edited by Ruth Shinar, Ioannis Kymissis, and Emil J. List-Kratochvil. SPIE, 2022. http://dx.doi.org/10.1117/12.2636103.

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4

Wu, Shuoen, Bogyeom Seo, and Tse Nga Ng. "Sensing dissolved oxygen through organic electrochemical transistors." In Organic and Hybrid Field-Effect Transistors XIX, edited by Oana D. Jurchescu and Iain McCulloch. SPIE, 2020. http://dx.doi.org/10.1117/12.2567181.

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5

Nielsen, Christian B. "New semiconductor design for organic electrochemical transistors." In Organic and Hybrid Field-Effect Transistors XX, edited by Oana D. Jurchescu and Iain McCulloch. SPIE, 2021. http://dx.doi.org/10.1117/12.2593416.

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6

Bongartz, Lukas M., Matteo Cucchi, Karl Leo, and Hans Kleemann. "On the modeling of organic electrochemical transistors." In Organic and Hybrid Sensors and Bioelectronics XV, edited by Ruth Shinar, Ioannis Kymissis, and Emil J. List-Kratochvil. SPIE, 2022. http://dx.doi.org/10.1117/12.2633291.

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7

Rivnay, Jonathan. "Subthreshold biosensing with organic electrochemical transistors (Conference Presentation)." In Organic and Hybrid Sensors and Bioelectronics XI, edited by Ruth Shinar, Ioannis Kymissis, Luisa Torsi, and Emil J. List-Kratochvil. SPIE, 2018. http://dx.doi.org/10.1117/12.2322387.

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8

Ng, Tse Nga, Shuoen Wu, and Jason D. Azoulay. "Dual-gate organic electrochemical transistors for marine sensing." In Organic and Hybrid Field-Effect Transistors XX, edited by Oana D. Jurchescu and Iain McCulloch. SPIE, 2021. http://dx.doi.org/10.1117/12.2593404.

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9

Bizeray, A., D. A. Howey, and S. Duncan. "Advanced battery management systems using fast electrochemical modelling." In Hybrid and Electric Vehicles Conference 2013 (HEVC 2013). Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/cp.2013.1890.

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10

Gkoupidenis, Paschalis, Dimitrios Koutsouras, Thomas Lonjaret, Shahab Rezaei-Mazinani, Esma Ismailova, Jessamyn A. Fairfield, and George G. Malliaras. "Organic neuromorphic devices based on electrochemical concepts (Conference Presentation)." In Hybrid Memory Devices and Printed Circuits 2017, edited by Emil J. List-Kratochvil. SPIE, 2017. http://dx.doi.org/10.1117/12.2272693.

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Звіти організацій з теми "HYBRID ELECTROCHEMICAL"

1

Greenway, Scott, Theodore Motyka, Claudio Corgnale, and Martin Sulic. Final Technical Report: Hybrid Electrochemical Hydrogen/Metal Hydride Compressor. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1989289.

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2

Liu, Hong. Novel Hybrid Microbial Electrochemical System for Efficient Hydrogen Generation from Biomass. Office of Scientific and Technical Information (OSTI), April 2020. http://dx.doi.org/10.2172/1813870.

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3

Miller, John, Lewis, B. Sibley, and John Wohlgemuth. Investigation of Synergy Between Electrochemical Capacitors, Flywheels, and Batteries in Hybrid Energy Storage for PV Systems. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/8380.

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