Electrochemical Properties of Activated Carbon Capacitor Adopting a Proton-conducting Hydrogel Polymer Electrolyte

摘要

An electric double-layer capacitor (ELDC) of activated carbon electrode is prepared using a proton-conducting hydrogel polymer electrolyte, which is composed of poly(vinyl alcohol), silicotungstic acid, H3PO4, and deionized water. A solid film by evaporating the hydrogel polymer electrolyte is also prepared for comparison. The hydrogel polymer electrolyte also acts as a separator with the thickness of about 80 pm and the room-temperature ionic conductivity of 10~(-2) S cm~(-1). The EDLC containing the symmetric electrodes of activated carbon shows the specific capacitance of 58 F g~(-1) at 100 mV s~(-1) with a good cycle life, implying that the hydrogel polymer electrolyte is very promising for use in EDLCs.