• 文献标题:   All Solid State Asymmetric Supercapacitors Based on CoNi2S4/Graphene Nanocomposite and Activated Carbon
  • 文献类型:   Article
  • 作  者:   DU WM, ZHU ZQ, GOU W, ZHAO WC, CHANG JJ, CAO X, ZHOU T, SHI YF
  • 作者关键词:   coni2s4, graphene, nanocomposite, solid state, asymmetric supercapacitor
  • 出版物名称:   SCIENCE OF ADVANCED MATERIALS
  • ISSN:   1947-2935 EI 1947-2943
  • 通讯作者地址:   Anyang Normal Univ
  • 被引频次:   3
  • DOI:   10.1166/sam.2018.3153
  • 出版年:   2018

▎ 摘  要

A facile solvothermal method was developed to prepare CoNi2S4 nanoparticles which were further modified with graphene to prepare CoNi2S4/graphene nanocomposite. The as-obtained CoNi2S4/graphene nanocomposite exhibited excellent electrochemical performances when the loaded amount of graphene was 5% wt. More importantly, all solid state asymmetric supercapacitors were successfully assembled with CoNi2S4/graphene(5%) nanocomposite as positive electrode, activated carbon as negative electrode, and polyvinyl alcohol/KOH gel as electrolyte. Electrochemical experimental results indicated that these asymmetric supercapacitors exhibited superior performance than the corresponding solid state symmetric supercapacitors with CoNi2S4/graphene(5%) nanocomposite (or activated carbon) as both positive and negative electrode, i.e., a wider operating voltage window of 0-1.6 V, energy density of 10.6 Wh kg(-1) at a power density of 940.1 W kg(-1) and excellent cycling stability. Meanwhile, two solid state asymmetric supercapacitors based on CoNi2S4/graphene(5%) nanocomposite connected in series were used to light three red light-emitting diodes and drive a rotating motor. All these remarkable outcomes demonstrate that solid state asymmetric supercapacitors based on CoNi2S4/graphene nanocomposite hold promise for application in portable electronic devices.