Premium
Formation of a Flower‐Like Co−Mo−S on Reduced Graphene Oxide Composite on Nickel Foam with Enhanced Electrochemical Capacitive Properties
Author(s) -
Yang Jing,
Xuan Haicheng,
Yang Guohui,
Liang Ting,
Han Xiaokun,
Gao Jinhong,
Xu Yuekui,
Xie Zhigao,
Han Peide,
Wang Dunhui,
Du Youwei
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801009
Subject(s) - supercapacitor , materials science , capacitance , graphene , electrode , composite number , electrochemistry , vulcanization , current density , oxide , nickel , chemical engineering , composite material , nanotechnology , metallurgy , chemistry , natural rubber , physics , quantum mechanics , engineering
Abstract Transition metal sulfides have attracted considerable attention due to their excellent electrochemical performance for supercapacitors. Herein, we prepared a Co 3 S 4 /CoMo 2 S 4 (Co−Mo−S) composite on reduced graphene oxide/Ni foam (RGO/NF) with unique flower‐like morphology through a carefully time‐controlled sulfurization process. It was found that the vulcanization time has a great influence on the morphology and electrochemical properties of the composites. After 3 hours of vulcanization, the as‐prepared Co 3 S 4 /CoMo 2 S 4 @RGO/NF electrode exhibited a superior specific capacitance of 2530.4 F g −1 at a current density of 1 A g −1 , as well as excellent cycling stability with 78.8 % retention of the initial capacitance even after 6,000 cycles at a current density of 10 A g −1 . An asymmetric device was assembled employing the Co 3 S 4 /CoMo 2 S 4 @RGO/NF composite as a positive electrode and activated carbon (AC) as a negative electrode. The device delivered a maximum energy density of 59.0 Wh kg −1 at a power density of 640 W kg −1 and a high cycling performance (90.7 % capacitance retention after 6,000 cycles). These results demonstrate the promising potential of Co−Mo−S@RGO/NF as binder‐free, high‐performance electrode in renewable energy storage systems.