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CuCo 2 S 4 Nanosheets Coupled With Carbon Nanotube Heterostructures for Highly Efficient Capacitive Energy Storage
Author(s) -
Li MeiLing,
Xiao Kang,
Su Hang,
Li Nan,
Cai YuePeng,
Liu ZhaoQing
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.201800329
Subject(s) - supercapacitor , materials science , capacitance , carbon nanotube , electrode , horizontal scan rate , electrochemistry , cobalt sulfide , chemical engineering , capacitive sensing , energy storage , nanotechnology , bimetallic strip , power density , optoelectronics , metal , cyclic voltammetry , metallurgy , chemistry , power (physics) , electrical engineering , physics , quantum mechanics , engineering
Highly efficient electrode materials with high specific capacitance, good rate capability, and durable cycling stability are of great importance for supercapacitors (SCs). Herein, we report a highly active electrode material based on carbon nanotubes (CNTs) as the supporter and copper cobalt bimetallic sulfide as the active material. The CuCo 2 S 4 /CNTs electrode exhibits a good electrochemical performance with a high specific capacity of 1690.3 F g −1 at 1 A g −1 , good rate capability with 62.6 % capacitance retention at 50 A g −1 , and good cycling stability that retains about 95.5 % of the capacitance after 10 000 cycles. The asymmetric supercapacitors (ACS) are self‐assembled by using CuCo 2 S 4 /CNTs as the positive electrode and CNTs as the negative electrode, exhibiting a high energy density of 37.32 Wh kg −1 at a power density of 800.7 W kg −1 . This work provides directly empirical evidence for the design and optimization of the supercapacitive performance of transition‐metal compounds.