Porous Graphene-Based Electrodes for Fiber-Shaped Supercapacitors with Good Electrical Conductivity

TS151; ;Graphene fibers(GFs)are ideal electrodes for fibrous supercapacitors because of their excellent mechanical and electrical properties.However,the actual specific surface area(SSA)of GFs is low due to the restacking of graphene sheets,which limits the capacitance enhancement of GFs.One of the effective ways to increase the SSA of GFs is to construct a porous fiber structure,but it disrupts the conductive pathway and adversely affects the electrochemical(EC)performance of GFs.Therefore,a wet-spun porous GF electrode coated with polypyrrole(PPy)was reported in this paper.The resulting electrode exhibits an areal specific capacitance of 31.25 mF·cm-2 and a good cycling stability with a capacitance retention rate of 95％after 5 000 charge/discharge cycles.These indicate that porous structures and PPy coating can synergistically improve the EC performance of GFs.