• 文献标题:   Flexible Solid-State Supercapacitor Based on Graphene-based Hybrid Films
  • 文献类型:   Article
  • 作  者:   LI M, TANG Z, LENG M, XUE JM
  • 作者关键词:  
  • 出版物名称:   ADVANCED FUNCTIONAL MATERIALS
  • ISSN:   1616-301X EI 1616-3028
  • 通讯作者地址:   Natl Univ Singapore
  • 被引频次:   100
  • DOI:   10.1002/adfm.201402442
  • 出版年:   2014

▎ 摘  要

A flexible solid-state asymmetric supercapacitor based on bendable film electrodes with 3D expressway-like architecture of graphenes and "hard nano-spacer" is fabricated via an extended filtration assisted method. In the designed structure of the positive electrode, graphene sheets are densely packed, and Ni(OH)(2) nanoplates are intercalated in between the densely stacked graphenes. The 3D expressway-like electrodes exhibit superior super-capacitive performance including high gravimetric capacitance (approximate to 573 F g(-1)), high volumetric capacitance (approximate to 655 F cm(-3)), excellent rate capability, and superior cycling stability. In addition, another hybrid film of graphene and carbon nanotubes (CNT) is fabricated as the negative electrodes for the designed asymmetric device. In the obtained graphene@CNT films, CNTs served as the hard spacer to prevent restacking of graphene sheets but also as a conductive and robust network to facilitate the electrons collection/transport in order to fulfill the demand of high-rate performance of the asymmetric supercapacitor. Based on these two hybrid electrode films, a solid-state flexible asymmetric supercapacitor device is assembled, which is able to deliver competitive volumetric capacitance of 58.5 F cm(-3) and good rate capacity. There is no obvious degradation of the supercapacitor performance when the device is in bending configuration, suggesting the excellent flexibility of the device.