Poly(3,4-ethylenedioxythiophene)-Graphene Composite Electrodes For Solid-State Supercapacitors with Ionic Liquid Gel Polymer Electrolyte

Poly(3,4-ethylenedioxythiophene) (PEDOT)-graphene composite films are prepared by a novel ultrashort galvanic pulse electropolymerization technique for application in solid-state supercapacitors. Scanning electron microscopy (SEM) studies show that morphology of the composite films is significantly modified by in situ incorporation of graphene. Solid-state supercapacitor cells using PEDOT-graphene composite electrodes and ionic liquid gel polymer electrolyte were fabricated and characterized. The impedance spectroscopy studies show that the PEDOT-graphene composite electrodes have specific capacitance value of similar to 80 F g(-1) as compared to similar to 56 F g(-1) of PEDOT electrodes and a significantly lower ion diffusion related resistance. The PEDOT-graphene composite electrodes based cell shows specific energy similar to 4.1 Wh kg(-1) and the corresponding specific power similar to 9.0 kW kg(-1) in the solid-state design.