MATERIALS FOR ELECTROCHEMICAL CAPACITORS - THEORETICAL AND EXPERIMENTAL CONSTRAINTS

Electrochemical capacitors, also called supercapacitors, are unique de vices exhibiting 20 to 200 times greater capacitance than conventional capacitors. The large capacitance exhibited by these systems has been demonstrated to arise from a combination of the double-layer capacita nce and pseudocapacitance associated with surface redox-type reactions . The purpose of this review is to survey the published data of availa ble electrode materials possessing high specific double-layer or pseud ocapacitance and examine their reported performance data in relation t o their theoretical expectations.