▎ 摘　　要

Nanofiber fabric is firstly introduced to replace common microflber fabrics as the platform for flexible supercapacitors. Nanofiber and microfiber electrodes can be simply fabricated using a dipping process that impregnates reduced graphene oxide (RGO) nanosheets into electrospun polyamide-66 (PA66) nanofiber and microflber fabrics. RGO nanosheets are tailored to various sizes and only RGO with a medium diameter of 250-450 nm (denoted as M-RGO) can effectively penetrate the pores of nanofiber fabrics for constructing smooth conductive paths within PA66 nanofiber fabrics. The synergistic effect between suitable sizes of RGO nanosheets and nanoflber fabrics with a high specific area provides a symmetric supercapacitor composed of M-RGO/PA66 nanofiber fabric electrodes with high-volume and high-area specific capacitance (C-S,C-V and C-S,C-A, equal to 38.79 F cm(-3) and 0.931 F cm(-2) at 0.5 A g(-1), respectively), which are much larger than that of a symmetric supercapacitor composed of RGO/PA66 microflber fabric electrodes (8.52 F cm(-3) and 0.213 F cm(-2) at 0.5 A g(-1)). The effect of impregnating nanofiber fabrics with suitably sized RGO to promote C-S,C-V and C-S,C-A of flexible supercapacitors has been demonstrated. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.