Journal
APPLIED SURFACE SCIENCE
Volume 487, Issue -, Pages 198-205Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.04.275
Keywords
CuCo2S4; Nanowire array; Sulfidation; Supercapacitor; High energy density
Categories
Funding
- National Natural Science Foundation of China [51572052]
- International Exchange Program of Harbin Engineering University for Innovation-oriented Talents Cultivation
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Binary transition metal sulfides are considered to be promising electrode materials for high-performance supercapacitors because of their ultrahigh electron conductivity and superior electrochemical activity compared to the unitary transition metal sulfides. In this work, copper cobalt sulfides nanowire arrays on nickel foam with different element ratios and porosities are prepared by using a two-step hydrothermal method, and their electrochemical performance is explored. Benefited from the high electrical conductivity, rich active sites and optimized microstructure, the optimized copper cobalt sulfides (CuCo2S4) electrode can achieve a ultrahigh specific capacitance of 2446.6 F.g(-1) at 1 A.g(-1) and favorable rate performance. The asymmetric supercapacitor assembled with the CuCo2S4 nanowire array and activated carbon (AC) electrodes displays a high energy density of 33.4 Wh.kg(-1) at a power density of 751.5 W.kg(-1) can be obtained. Additionally, the assembled asymmetric cell shows a favorable capacitance retention of 78% after charging and discharging for 10,000 cycles at a high current density of 4 A.g(-1).
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