DEPENDENCE ON THE ELECTROLYTE SOLUTION OF THE CAPACITANCE OF ACTIVE-CARBON FIBER ELECTRODE FOR ELECTRIC DOUBLE-LAYER CAPACITOR

Double layer capacitance of phenoric-resin based active carbon fiber ( ACF) electrode was enhanced by a method of electrochemical treatment i n various acidic electrolytes. Oxidic acids, especially perchloric aci d solution, showed higher enhancement of the ACF capacitance by the el ectrochemical treatment. Thus, the capacitor was constructed with usin g 1.0 mol dm(-3) HClO4 electrolyte solution and ACF electrode oxidized at 1.0 V vs. SCE for 1 h. The capacitor gives charging-discharging ch aracteristics better than that of H2SO4 electrolyte system.