sc8b05951_si_001.pdf (332.98 kB)
Reclaimed Carbon Fiber-Based 2.4 V Aqueous Symmetric Supercapacitors
journal contribution
posted on 2019-02-11, 00:00 authored by Yanan Zhou, Zhaoqiang Zhu, Chunhua Zhao, Kefu Zhang, Bailing Wang, Chongjun Zhao, Guorong ChenCarbon
fiber (CF) is a promising material as carbon-based electrode
and support for flexible supercapacitors. However, it still suffers
from narrow voltage in the aqueous electrolyte due to the water decomposition
(1.23 V). Herein, an aerobic pyrolysis is developed to recover aligned
carbon fibers from carbon fiber reinforced polymers. More importantly,
during this oxygen existence condition, the surface of reclaimed carbon
fibers (RCFs) is etched into groove-shaped structure and modified
by introducing abundant oxygen-containing functional groups, which
significantly expands the negative potential window of RCFs-based
electrode to −1.4 V (vs standard calomel electrode) and the
working voltage of RCFs-based symmetric supercapacitor to 2.4 V in
an aqueous electrolyte of 1.0 M Na2SO4, with
capacitance retention of 90% and 93.6% after 10 000 cycles,
respectively. This work well matches the aerobic pyrolysis of recovery of CFs from CFRPs and
electrochemical performances of RCFs, supplying a new strategy to
develop high-performance energy storage device.