• 文献标题:   A core/shell structured tubular graphene nanoflake-coated polypyrrole hybrid for all-solid-state flexible supercapacitors
  • 文献类型:   Article
  • 作  者:   QI K, HOU RZ, ZAMAN S, XIA BY, DUAN HW
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Huazhong Univ Sci Technol
  • 被引频次:   27
  • DOI:   10.1039/c7ta11245a
  • 出版年:   2018

▎ 摘  要

A core/shell tubular structured graphene nanoflake-coated polypyrrole nanotube (GNF/PNT) hybrid is fabricated for all-solid-state flexible supercapacitors. Functionalization of a controlled coating amount of GNFs onto PNTs is achieved via chemical covalent bonds generated by acylation of the N-H positions of the PNT surface with the carboxyl groups of GNFs. The GNF coating not only acts as an efficient surface protector, but also serves as the electron transfer pathway; meanwhile, a controlled coating amount of GNFs optimizes the capacitance of the whole composite. A stable cycling performance and large capacitance as well as high capacitance retention of the GNF/PNT hybrid are therefore achieved. A flexible all-solid-state symmetric supercapacitor device is also assembled, which demonstrates (at 1.8 mA cm(-2)) an areal capacitance of 128 mF cm(-2), an energy density of 11.4 mW h cm(-2) at a power density of 720 mW cm(-2), and a cycling stability of over 80% capacitance retention after 5000 cycles. This study demonstrates a facile strategy for designing novel conductive polymers/graphene composites with enhanced cycling stability in all-solid-state flexible supercapacitors and beyond.