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High‐Performance Flexible Asymmetric Supercapacitors Facilitated by N‐doped Porous Vertical Graphene Nanomesh Arrays
Author(s) -
Chi Kai,
Zhang Xiangyu,
Tian Xin,
Zhang Zheye,
Wu Zhu,
Xiao Fei,
Wang Shuai
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901499
Subject(s) - nanomesh , supercapacitor , materials science , graphene , nanotechnology , electrode , capacitance , porosity , fabrication , specific surface area , doping , optoelectronics , composite material , chemistry , medicine , biochemistry , alternative medicine , pathology , catalysis
The design of self‐supporting electrode scaffold with large surface area, good flexibility, and high electrical conductivity is of great significance to the development of high performance flexible supercapacitors. Herein, we report the fabrication of N‐doped porous vertical graphene nanomesh arrays (NVGMs) on flexible carbon cloth (CC) substrate (CC@NVGMs) via a facile self‐sacrificing template method. The NVGMs provide large surface area, more growth sites of active materials, good electrical conductivity and short diffusion paths, leading to greatly enhanced performance. After decorating MnO 2 nanosheets and polypyrrole films on the NVGMs, the hierarchical nanohybrid electrodes show notable improvement of areal capacitances, greatly decrease of equivalent series resistance, significantly enhancement of rate performance, compare to those of the active materials on bare CC. Furthermore, the flexible asymmetric supercapacitor is assembled by these two nanohybrid electrodes has an energy density of up to 1.92 mWh cm −3 .