• 文献标题:   Heating Rate-Controlled Thermal Exfoliation for Foldable Graphene Sponge
  • 文献类型:   Article
  • 作  者:   WEI W, GUAN TX, LI C, SHEN LM, BAO NZ
  • 作者关键词:  
  • 出版物名称:   INDUSTRIAL ENGINEERING CHEMISTRY RESEARCH
  • ISSN:   0888-5885
  • 通讯作者地址:   Nanjing Tech Univ
  • 被引频次:   0
  • DOI:   10.1021/acs.iecr.9b06114
  • 出版年:   2020

▎ 摘  要

Foldable supercapacitors are desired for the next generation of wearable electronics. In this study, highly foldable graphene sponges with a honeycomb structure are prepared at 300 degrees C using the convenient thermal exfoliation process. A slow heating rate (5-10 degrees C-min(-1)) around 200 degrees C and an external confinement force are critical to a favorable exfoliation degree and uniform thickness of the graphene sponges. After being annealed at 1050 degrees C for 1 h, the conductivity of the graphene sponge has been improved from 2700 to 6900 S.m(-1) without degrading its flexibility. The capacitance of the annealed graphene sponge has been measured in an aqueous electrolyte solution of 1 M Na2SO4. Its best capacitance is 138.74 F.g(-1), and it reduces by 3.6% at a half-fold state and by 8.9% at a quarter-fold state.