Abstract
The fabrication and evaluation of solid-state supercapacitors based on a Nafion electrolyte in aqueous and nonaqueous systems are described. The Nafion membrane in a nonaqueous system is impregnated with 30% of phosphoricacid in ethylene glycol and characterized in a supercapacitor configuration by cyclic voltammetry and ac impedance spectroscopy. A high proton conductivity of 2.2 X 10 - 2 S cm - 1 for the Nafion-based supercapacitor in the nonaqueous system was measured at room temperature and is about half that of the aqueous system. A capacitance of 90 F/g and an energy density of 7 Wh/kg for the nonaqueous supercapacitor was obtained. A stable capacitance performance was demonstrated for 2500 cycles in a potential range from 0 to 1.5 V.
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