文献类型：期刊文献

英文题名：Flexible all-solid-state supercapacitors based on graphene/carbon black nanoparticle film electrodes and cross-linked poly(vinyl alcohol)-H2SO4 porous gel electrolytes

作者：Fei, Haojie[1];Yang, Chongyang[1];Bao, Hua[1];Wang, Gengchao[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2014

卷号：266

起止页码：488

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20142417824277);WOS:【SCI-EXPANDED(收录号:WOS:000338806300063)】；

基金：We greatly appreciate the financial supports of National Natural Science Foundation of China (51173042), Fundamental Research Funds for the Central Universities, Shanghai Municipal Science and Technology Commission (12nm0504102).

语种：英文

外文关键词：Poly(vinyl alcohol); Porous gel electrolytes; Graphene; All-solid-state; Flexible supercapacitors

摘要：Flexible all-solid-state supercapacitors (SCs) are fabricated using graphene/carbon black nanoparticle (GCB) film electrodes and cross-linked poly(vinyl alcohol)-H2SO4 porous gel electrolytes (gPVAP -H2SO4). The GCB composite films, with carbon black (CB) nanoparticles uniformly distributed in the graphene nanosheets, greatly improve the active surface areas and ion transportation of pristine graphene film. The porous structure of as-prepared gPVAP-H2SO4 membrane improves the equilibrium swelling ratio in electrolyte and provides interconnected ion transport channels. The chemical cross-linking solves the fluidity problem of PVA-H2SO4 gel electrolyte at high temperature. As-fabricated GCB//gPVAP(20)-H2SO4//GCB flexible SC displays an increased specific capacitance (144.5 F g(-1) at 0.5 A g(-1)) and a higher specific capacitance retention (67.9% from 0.2 to 4 A g(-1)). More importantly, the flexible SC possesses good electrochemical performance at high temperature (capacitance retention of 78.3% after 1000 cycles at 70 degrees C). (C) 2014 Elsevier B.V. All rights reserved.