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Nano Research

, Volume 11, Issue 3, pp 1415–1425 | Cite as

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

  • Weidong He
  • Zhifu Liang
  • Keyu Ji
  • Qingfeng SunEmail author
  • Tianyou ZhaiEmail author
  • Xijin XuEmail author
Research Article

Abstract

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.

Keywords

core/shell structure free-standing electrode supercapacitors high energy density excellent stability 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51672109), National Basic Research Program of China (No. 2015CB932600), Program for HUST Interdisciplinary Innovation Team (No. 2015ZDTD038) and the Fundamental Research Funds for the Central University (No. 2017KFKJXX007), Natural Science Foundation of Shandong Province for Excellent Young Scholars (No. ZR2016JL015), Scientific Research Foundation of Zhejiang A&F University (No. 2014FR077).

Supplementary material

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

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© Tsinghua University Press and Springer-Verlag GmbH Germany 2018

Authors and Affiliations

  1. 1.School of Physics and TechnologyUniversity of JinanJinanChina
  2. 2.State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and EngineeringHuazhong University of Science and Technology (HUST)WuhanChina
  3. 3.School of EngineeringZhejiang A & F UniversityHangzhouChina

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