The data were presented on study by electrochemical properties (the redox potential, the effective number of electrons, half-wave potential, current density) of thermally expanded graphite and oxidized graphite modified with metal salts (Fe2+, Co2+, Ni2+, Cu2+, Zn2+) in alkaline environment.
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.
The data on the electrochemical and electro catalytic properties of natural (NG), oxidized (OG), thermo expanded (TWG) graphite and graphite oxide (GO) are presented. The evaluation of the electrocatalytic activity of graphites for the reduction of dioxygen in an alkaline solution was carried out. The effective number of electrons for the given process was determined.
New carbon materials such as oxidized (OG) and thermally expanded (TEG) graphite modified with salts of transition metals have been applied in chemical power sources (CPS) as a catalyst. An optimal combination of properties of the porous structure and chemical composition of the surface allows creating high power adsorption system. Particular attention is paid to the system of oxygen storage, widely used in various fields of human activity. The electrocatalytic activity and electrochemical properties of various carbon materials modified with salts of cobalt and iron were studied by cyclic voltammetry in alkaline solution. Working electrode polarization modes are set using the potentiostat and the PC with the interface unit. The current-voltage graphs were obtained on a personal computer with advanced signal processing on the interface device. The relative error does not exceed 3% at the determination of the redox potential values. The potentials were recorded for the observed processes with an accuracy of ± 0.01. The Randles – Shevchik equation was used to calculate the number of electrons in order to clarify the mechanism of electroreduction process in a flow of molecular oxygen (2 or 4). To assess the effect of electrocatalisis not only high current density can be used, but also the half-wave potential of the reduction of molecular oxygen. On the cathode side of the graph with the introduction of oxygen into the electrolyte there is a significant increase in current at the potential range from -0.2 to -0.6 V and from -0.7 to -0.9 V the increase in current occurs due to a process of electroreduction of molecular oxygen. Quantified characteristics of adsorption of molecular oxygen, such as the maximum amount of adsorption and Langmuir adsorption coefficient were determined based on the electrochemical properties. Langmuir adsorption coefficient characterizes the interaction energy of the adsorbate with the adsorbent. The data obtained can be used for further research cathodes with air (oxygen) depolarization.For citation:Filimonov D.A., Yudina T.F., Bazanov M.I., Bratkov I.V., Leontiev N.A. Electrochemical properties of various carbon materials. Calculation of oxygen adsorption. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 20-25.
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