scholarly journals ELECTROPHORETIC DEPOSITION OF DISPERSED GRAPHITE AND ELECTROCHEMICAL PROPERTIES OF OBTAINED FILMS

2017 ◽  
Vol 60 (3) ◽  
pp. 77
Author(s):  
Ilya V. Bratkov ◽  
Tatyana F. Yudina ◽  
Aleksey G. Mel'nikov ◽  
Tatiana V. Ershova ◽  
Dmitriy A. Filimonov
Keyword(s):  
Electrochemical Properties ◽  
Electrophoretic Deposition ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Stainless Steel Electrode ◽  
Anodic Current Density ◽  
Potential Sweep ◽  
Carbon Phase ◽  
Steel Electrode ◽  
Power Sources

The paper considers the problems of obtaining the new electrode materials used in the electric power sources. The electrode material was prepared by anodic electrophoretic deposition in an alkaline medium of graphite nanosized particles. Nanoscale carbon phase was obtained by graphite foil anodic polarization in sulfuric acid followed by ultrasonic dispersing of the obtained powder. Electrophoretic coatings were deposited on a stainless steel electrode at applied potentials in the range of 5-10 V. The dependence of the anodic current density and specific capacity of the deposited film is linear on the anode potential. The method of FT-IR spectroscopy to study the properties of the surface of the obtained film was used. It was shown that as a result of electrophoresis the sufficiently strong reduction of surface oxygen-containing groups represented mainly phenolic groups occurs. The optimal value of the potential for deposition of electrophoretic films - 5 V, for a given value after 5 min of electrophoresis formed film thickness is 430 nm with a minimum content of oxygen-containing surface groups. Electrochemical properties of the resulting films were determined with a cyclic voltammetry in an acidic medium. It was found that at value of the potential sweep rate of 20 mV/s the specific film capacity was 117 F/g.Forcitation:Bratkov I.V., Yudina T.F., Mel'nikov A.G., Ershova T.V., Filimonov D.A. Electrophoretic deposition of dispersed graphite and electrochemical properties of obtained films. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 3. P. 77-82.

scholarly journals One−Step Synthesis of Popcorn−Carbon/Co3O4 Composites as High−Performance Supercapacitor Electrodes

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 76
Author(s):  
Ruiyu Wang ◽  
Mengfan Zhang ◽  
Hao Xu ◽  
Shuo Guo ◽  
Mengqi Chi ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Electrochemical Properties ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Co3o4 Nanoparticles ◽  
X Ray ◽  
Plasma Electrolysis ◽  
One Step ◽  
Liquid Phase Plasma

In this study, a novel assisted liquid−phase plasma electrolysis was developed to realize one−step synthesis of popcorn biomass−derived porous carbon/cobalt tetroxide (popcorn−carbon/Co3O4) composites, effectively improving the structural stability and conductivity of Co3O4. The phase structure, morphologies, chemical composition, and weight ratio of the as−prepared popcorn−carbon/Co3O4 composites were systematically analyzed. The results of X−ray diffraction (XRD), Raman spectrometer, Fourier infrared spectrometer (FTIR), X−ray photoelectron spectrometer (XPS), and thermogravimetry analyzer (TG) proved the synthesis of the popcorn−carbon/Co3O4 composites. Co3O4 nanoparticles were distributed relatively uniformly on the popcorn−carbon surface. The electrochemical properties of the popcorn−carbon/Co3O4 composite electrode materials were analyzed for exploring the influence of different Co/C ratios on the electrochemical properties of composites. The results showed that the popcorn−carbon/Co3O4 composite electrode materials prepared under 200:1 mass ratio of Co(NO3)2·6H2O and popcorn−carbon possessed a specific capacitance and specific capacity of almost 1264 F/g (594 C/g) at a current density of 1 A/g, exhibiting a better electrochemical property. The efficient, fast, and novel assisted liquid−phase plasma electrolysis provides a new method for the preparation of composite electrode materials on the supercapacitors.

scholarly journals Synthesis and Characterization of Electrophoretically Deposited Nanostructured LiCoPO4 for Rechargeable Lithium Ion Batteries

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
S. Priya Nair ◽  
U. Jyothsna ◽  
P. Praveen ◽  
A. Balakrishnan ◽  
K. R. V. Subramanian ◽  
...  
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Electrophoretic Deposition ◽  
Sol Gel ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Deposition Process ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Charge Discharge

Nanosized LiCoPO4 (LCP) was prepared using a simple sol-gel method. For the first time, electrophoretic deposition process was employed to fabricate a LiCoPO4 cathode material in order to improve the electrochemical performance. The prepared powder was deposited on titanium plate by electrophoretic deposition and their electrochemical properties were studied. The electrochemical properties were analyzed by using cyclic voltagramm studies, impedance studies, and charge/discharge tests. The thickness of the prepared cathode material was found to be 11-12 µm by using scanning electron microscope. The initial specific capacity and the charge transfer resistance (Rct) of the prepared cathode was 103 mAh/g and 851 Ω, respectively. The charge/discharge profiles showed moderate columbic efficiency of 70%.

scholarly journals Mechanisms and Product Options of Magnesiothermic Reduction of Silica to Silicon for Lithium-Ion Battery Applications

2021 ◽  
Vol 9 ◽  
Author(s):  
Yu Tan ◽  
Tingting Jiang ◽  
George Z. Chen
Keyword(s):  
Electrode Materials ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Lithium Ion ◽  
High Energy ◽  
Cycle Life ◽  
Potential Range ◽  
Magnesiothermic Reduction ◽  
Power Sources ◽  
Long Cycle Life

Lithium-ion batteries (LIBs) have been one of the most predominant rechargeable power sources due to their high energy/power density and long cycle life. As one of the most promising candidates for the new generation negative electrode materials in LIBs, silicon has the advantages of high specific capacity, a lithiation potential range close to that of lithium deposition, and rich abundance in the earth’s crust. However, the commercial use of silicon in LIBs is still limited by the short cycle life and poor rate performance due to the severe volume change during Li++ insertion/extraction, as well as the unsatisfactory conduction of electron and Li+ through silicon matrix. Therefore, many efforts have been made to control and stabilize the structures of silicon. Magnesiothermic reduction has been extensively demonstrated as a promising process for making porous silicon with micro- or nanosized structures for better electrochemical performance in LIBs. This article provides a brief but critical overview of magnesiothermic reduction under various conditions in several aspects, including the thermodynamics and mechanism of the reaction, the influences of the precursor and reaction conditions on the dynamics of the reduction, and the interface control and its effect on the morphology as well as the final performance of the silicon. These outcomes will bring about a clearer vision and better understanding on the production of silicon by magnesiothermic reduction for LIBs application.

Morphological and Electrochemical Properties of the Lactose-derived Carbon Electrode Materials

2016 ◽  
Vol 8 (3) ◽  
pp. 03017-1-03017-7 ◽  
Author(s):  
I. F. Myronyuk ◽  
◽  
V. I. Mandzyuk ◽  
V. M. Sachko ◽  
R. P. Lisovsky ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Carbon Electrode

scholarly journals Controlled Nanostructuration of Cobalt Oxyhydroxide Electrode Material for Hybrid Supercapacitors

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2325
Author(s):  
Ronan Invernizzi ◽  
Liliane Guerlou-Demourgues ◽  
François Weill ◽  
Alexia Lemoine ◽  
Marie-Anne Dourges ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Energy Storage ◽  
Specific Surface ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Hybrid Supercapacitors ◽  
Cobalt Oxyhydroxide ◽  
Precipitation Medium ◽  
The Impact

Nanostructuration is one of the most promising strategies to develop performant electrode materials for energy storage devices, such as hybrid supercapacitors. In this work, we studied the influence of precipitation medium and the use of a series of 1-alkyl-3-methylimidazolium bromide ionic liquids for the nanostructuration of β(III) cobalt oxyhydroxides. Then, the effect of the nanostructuration and the impact of the different ionic liquids used during synthesis were investigated in terms of energy storage performances. First, we demonstrated that forward precipitation, in a cobalt-rich medium, leads to smaller particles with higher specific surface areas (SSA) and an enhanced mesoporosity. Introduction of ionic liquids (ILs) in the precipitation medium further strongly increased the specific surface area and the mesoporosity to achieve well-nanostructured materials with a very high SSA of 265 m2/g and porosity of 0.43 cm3/g. Additionally, we showed that ILs used as surfactant and template also functionalize the nanomaterial surface, leading to a beneficial synergy between the highly ionic conductive IL and the cobalt oxyhydroxide, which lowers the resistance charge transfer and improves the specific capacity. The nature of the ionic liquid had an important influence on the final electrochemical properties and the best performances were reached with the ionic liquid containing the longest alkyl chain.

scholarly journals Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Yiqiu Xiang ◽  
Ling Xin ◽  
Jiwei Hu ◽  
Caifang Li ◽  
Jimei Qi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fuel Cells ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Clean Energy ◽  
Proton Exchange ◽  
Energy Storage And Conversion ◽  
Thermoelectric Conversion

Extensive use of fossil fuels can lead to energy depletion and serious environmental pollution. Therefore, it is necessary to solve these problems by developing clean energy. Graphene materials own the advantages of high electrocatalytic activity, high conductivity, excellent mechanical strength, strong flexibility, large specific surface area and light weight, thus giving the potential to store electric charge, ions or hydrogen. Graphene-based nanocomposites have become new research hotspots in the field of energy storage and conversion, such as in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion. Graphene as a catalyst carrier of hydrogen fuel cells has been further modified to obtain higher and more uniform metal dispersion, hence improving the electrocatalyst activity. Moreover, it can complement the network of electroactive materials to buffer the change of electrode volume and prevent the breakage and aggregation of electrode materials, and graphene oxide is also used as a cheap and sustainable proton exchange membrane. In lithium-ion batteries, substituting heteroatoms for carbon atoms in graphene composite electrodes can produce defects on the graphitized surface which have a good reversible specific capacity and increased energy and power densities. In solar cells, the performance of the interface and junction is enhanced by using a few layers of graphene-based composites and more electron-hole pairs are collected; therefore, the conversion efficiency is increased. Graphene has a high Seebeck coefficient, and therefore, it is a potential thermoelectric material. In this paper, we review the latest progress in the synthesis, characterization, evaluation and properties of graphene-based composites and their practical applications in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion.

Iron Phosphate/Bacteria Composites as Precursors for Textured Electrode Materials with Enhanced Electrochemical Properties

2016 ◽  
Vol 163 (10) ◽  
pp. A2139-A2148 ◽  
Author(s):  
B. Mirvaux ◽  
N. Recham ◽  
J. Miot ◽  
M. Courty ◽  
S. Bernard ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Iron Phosphate
Sign in / Sign up

Export Citation Format

Share Document