Hierarchical Ni-Co-S@Ni-W-O core-shell nanosheet arrays on nickel foam for high-performance asymmetric supercapacitors

Nickel cobalt sulfides （Ni-Co-S） have attracted extensive attention for application in electronic devices owing to their excellent conductivity and high electrochemical capacitance. To facilitate the large-scale practical application of Ni-Co-S, the excellent rate capability and cyclic stability of...

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Bibliographic Details
Published in:Nano research 2018-03, Vol.11 (3), p.1415-1425
Main Authors: He, Weidong, Liang, Zhifu, Ji, Keyu, Sun, Qingfeng, Zhai, Tianyou, Xu, Xijin
Format: Article
Language:English
Subjects:
Activated carbon
Annealing furnaces
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Capacitance
Chemistry and Materials Science
Cobalt
Condensed Matter Physics
Electrochemistry
Electrodes
Electronic devices
Electronic equipment
Flux density
Materials Science
Metal foams
Nanosheets
Nanotechnology
Nickel
Research Article
Stability
Supercapacitors
不对称
镍钴
数组
泡沫
电气化学
电子设备
混合结构
稳定性
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Summary:Nickel cobalt sulfides （Ni-Co-S） have attracted extensive attention for application in electronic devices owing to their excellent conductivity and high electrochemical capacitance. To facilitate the large-scale practical application of Ni-Co-S, the excellent rate capability and cyclic stability of these compounds must be fully exploited. Thus, hierarchical Ni-Co-S@Ni-W-O （Ni-Co-S-W） core/shell hybrid nanosheet arrays on nickel foam were designed and synthesized herein via a facile three-step hydrothermal method, followed by annealing in a tubular furnace under argon atmosphere. The hybrid structure was directly assembled as a free-standing electrode, which exhibited a high specific capacitance of 1,988 F·g^-1 at 2 A·g^-1 and retained an excellent capacitance of approximately 1,500 F·g^-1 at 30 A·g^-1, which is superior to the performance of the pristine Ni-Co-S nanosheet electrode. The assembled asymmetric supercapacitors achieved high specific capacitance （155 F·g^-1 at 1 A·g^-1）, electrochemical stability, and a high energy density of 55.1 W·h·kg^-1 at a power density of 799.8 W·kg^-1 with the optimized Ni-Co-S-W core/shell nanosheets as the positive electrode, activated carbon as the negative electrode, and 6 M KOH as the electrolyte.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-017-1757-2