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Electrochemical modification of graphite felt used for vanadium battery

  In the global energy crisis and environmental pollution under the background of governments on the development and utilization of key technology and energy related very seriously, new energy countries vigorously develop clean and renewable energy to reduce the traditional. To develop new energy resources, energy storage is the key. With the application of new energy sources such as solar energy and wind energy, the research of new energy storage technology with high efficiency, long life and low cost is especially important.

  The graphite felt electrode was modified by the method of constant current step activation, and the high performance carbon electrode material was prepared.

  As the graphite felt has the advantages of high surface area, good chemical stability, low price, good conductivity, electrode materials have been widely used in electrochemical capacitor and redox flow battery of these large energy storage devices.

  But the surface of the carbon material operation on the surface of microporous electrode directly, containing hydrophilic group is relatively small, and most of them are hydrophobic organic groups of water, so the surface wettability is poor, difficult to penetrate into the surface of the electrode electrolyte, not easy to form electric double layer, the carbon materials can not achieve the theory specific capacitance value.

  It is found that the carbon material after several physical and chemical methods of surface modification, will generate some oxygen containing functional groups, the increase of material wettability, increase the effective surface area, and increase the specific capacitance of carbon materials. Therefore, research on surface modification of carbon materials to carry out a large number of methods, scholars at home and abroad are mainly used in gas phase oxidation, liquid phase oxidation, anodic oxidation, plasma oxidation, microwave oxidation etc..