A core/shell structured tubular graphene nanoflake-coated polypyrrole hybrid for all-solid-state flexible supercapacitors

作者：Qi, Kai; Hou, Ruizuo; Zaman, Shahid; Xia, Bao Yu^*; Duan, Hongwei^*

来源：Journal of Materials Chemistry A, 2018, 6(9): 3913-3918.

DOI：10.1039/c7ta11245a

• WEARABLE ENERGY-STORAGE
• HIGH-PERFORMANCE
• ELECTRODE MATERIALS
• QUANTUM DOTS
• CARBON
• POLYANILINE
• NANOTUBES
• REDUCTION
• COMPOSITE
• ELECTROCATALYSTS

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.

• 出版日期2018-3-7
• 单位南阳理工学院; 华中科技大学