A high-performance asymmetric supercapacitor based on Ni3S2-coated NiSe arrays as positive electrode

NiSe rods coated with cotton-like Ni3S2 were directly grown on nickel foam through a two-step process, comprising selenization and electrodeposition. The as-obtained NiSe/Ni3S2 composite electrode exhibited excellent electrochemical properties, with a high specific capacitance of 8.81 F cm−2 (1259.3...

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Bibliographic Details
Published in:New journal of chemistry 2019, Vol.43 (5), p.2389-2399
Main Authors: Ye, Beirong, Gong, Chao, Huang, Miaoliang, Ge, Jinhua, Fan, Leqing, Lin, Jianming, Wu, Jihuai
Format: Article
Language:English
Subjects:
Coated electrodes
Cotton
Current density
Electrochemical analysis
Electrodes
Flux density
Lithium
Metal foams
Nickel sulfide
Supercapacitors
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Summary:NiSe rods coated with cotton-like Ni3S2 were directly grown on nickel foam through a two-step process, comprising selenization and electrodeposition. The as-obtained NiSe/Ni3S2 composite electrode exhibited excellent electrochemical properties, with a high specific capacitance of 8.81 F cm−2 (1259.3 F g−1) at a current density of 4 mA cm−2, which was better than the value of pure NiSe electrode (5.17 F cm−2; 861.8 F g−1) at the same current density. Moreover, an asymmetric supercapacitor (ASC) was fabricated using NiSe/Ni3S2 electrode and AC electrode as positive electrode and negative electrode, respectively. This ASC extended the potential window to 1.6 V and was possessed of a superior energy density of 38.7 W h kg−1 at a power density of 192 W kg−1, with outstanding cycling stability (85.9% retention after 10 000 cycles).
ISSN:1144-0546
1369-9261
DOI:10.1039/c8nj05399e