Electrochemical Behavior of Halogen-doped Carbon Materials as Capacitor Electrodes

Modification of carbon material is one of the keys to improve the electrode of Electric double-layered capacitor. Some halogens are known to react with carbon strongly to form intercalation compounds or residual ones with p-doping. In the present paper, bromine and iodine vapors are reacted with various carbon materials such as graphite, activated carbon and single-walled carbon nanotube and their electrochemical behaviors in the electrolyte of 1M (C2H5)4NBF4 / propylene carbonate were investigated. The pseudo capacitances of their halogen-predoped carbons due to the undope/redope of halogens from/into carbon electrodes were discussed from their cyclic voltammetris