All-solid-state supercapacitors with poly(3,4-ethylenedioxythiophene) coated carbon fiber paper electrodes and ionic liquid gel polymer electrolyte

摘要

All-solid-state thin supercapacitors have been fabricated using current pulse polymerized poly(3,4-ethylenedioxythiophene) (PEDOT) over carbon fiber paper and ionic liquid based gel polymer electrolyte. The PEDOT-coated carbon paper electrodes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) which confirm the porous morphology of PEDOT at the nanoscale and a high degree of CIO~-_4 dopant ion conjugation. The performance characteristics of the supercapacitor cells have been evaluated by ac impedance spectroscopy, cyclic voltammetry and galvanostatic charge-discharge techniques. The PEDOT electrode shows specific capacitance of ～154.5 F g~(-1), which correspond to the cell area-normalized capacitance of 85 mF cm~(-2). The maximum specific energy and specific power of the solid-state super-capacitor cell, calculated from charge-discharge characteristics, are 6.5 Wh kg~(-1) and 11.3 kW kg~(-1), respectively. The solid-state supercapacitor shows good cycle durability and time stability. The thin, lightweight, gel electrolyte based supercapacitor shows considerable potential for low-cost, high-performance energy storage applications.