Amorphous MoSx nanoparticles grown on cobalt-iron-based needle-like array for high-performance flexible asymmetric supercapacitor
By Zhao, Yan; Wang, Sichao; Yuan, Ming; Chen, Yuan; Huang, Yunpeng; Lian, Jiabiao; Yang, Shiliu; Li, Huaming; Wu, Limin
Published in Chemical Engineering Journal
Chemical Engineering Journal
2020
Abstract
Although flexible supercapacitors have important applications, the development of high-performance flexible supercapacitors still remains a critical challenge owing to the low ion diffusion rate, poor electro-conductivity, and limited active defect sites. Herein, we report the first amorphous MoSx nanoparticles grown on crystalline FeCo-based nanoneedles (FC@MS-EG) via an ethylene glycol-induced strategy. The FC@MS-EG electrode presents an unprecedented specific capacitance of 1956 F g?1 at 1 A g?1 and over 91.1% of capacitance retention even after 6000 cycles because of the unique morphology, the rich defect sites, the high carrier concentration. The FC@MS-EG//AC asymmetric supercapacitor delivers an ultrahigh specific capacitance of 282 F g?1 at 1 A g?1 and an excellent energy density of 88.09 Wh kg?1 along with a power density of 750 W kg?1. And the self-assembled flexible all-solid-state supercapacitor device can be easily bent and twisted with negligible electrochemical properties attenuation.