posted on 2017-04-17, 00:00authored byKang Xiao, Yanhua Zeng, Jin Long, Hongbin Chen, Liang-Xin Ding, Suqing Wang, Haihui Wang
Freestanding three-dimensional
nitrogen-doped carbon foam with
large pores is proposed as a promising electrode configuration for
elastic electronics. Although it exhibits excellent mechanical performance,
the capacitive performances (especially its rate capability) are still
unsatisfactory. By using KMnO4, we demonstrate a smart
etching and catalytic process to form highly graphitized and etched
nitrogen-doped carbon foam (ENCF) with an exfoliated carbon-shell
architecture. These compositional and structural features endow the
ENCF electrodes with excellent electron conductivity as well as more
ion-accessible electrochemical active sites. Significantly, all-solid-state
symmetric supercapacitor devices based on the ENCF electrodes exhibit
enhanced specific capacitance and marked high-rate capability. Furthermore,
the integrated device has no significant capacity loss under 60% compressive
strain.