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Acid treatment is an oxidation process to graphite felt. Usually using concentrated sulfuric acid, nitric acid, potassium dichromate to modify the graphite felt.put the graphite felt into concentrated sulfuric acid and under boiling situation for 5h,then make it as electrode material for vanadium redox flow battery,it could make the energy efficiency increase to about 90%.the result of testing shows that after the treatment of concentrated sulfuric acid,it can reduce the electric resistance of the electrode material,and the electrochemical property of the graphite felt can increase with the concentration of the sulfuric acid.the number of the active group on the surface of graphite felt have an obvious increase. Some researchs showed that the graphite felt under the mixed acid and boiling…
The graphite felt used in the vanadium redox flow battery need a treatment to make it have a larger specific surface area,more oxygen functional groups and lower electronic resistance,by these ways to improve the electrochemical property. The main ways to improve the graphite felt include:heat treatment,acid treatment,electrochemistry treatment etc.In addition to those single method,it also has comprehensive treatment of the graphite felt. To the Pan base graphite felt,after 5h of concentrated sulfuric acid environment,and then make it in the 450℃ environment for 2h,the results show that it could increase the electrochemical property of the electrode material in the V4+ solution.by the testing of SEM,the impurity on the surface of the graphite felt is removed,and the number of the surface active…
1、Graphite electrodes can be used As refractory material: graphite and its products have properties of high - strength, high temperature resistance, mainly used to produce graphite crucible in the metallurgical industry, in steelmaking in graphite is usually used for the protection of steel ingot agent, metallurgical furnace lining. 2、Graphite electrodes can be used as the Conductive material: in the electrical industry as manufacturing electrode, carbon brush, carbon rod, carbon nanotubes, mercury is the cathode, graphite gaskets, telephone parts, TV picture tube coating. 3、Graphite electrodes can be used as Wear resistant lubricating material: graphite is often used as a lubricant in the mechanical industry. Lubricating oil is often not used in high speed, high temperature and high pressure, while the graphite…
