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Hydrothermal preparation of CQDs/MoS2/NiSe2 composite as electrode material for supercapacitor

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Abstract

A simple hydrothermal method was used to synthesize four kinds of electrode materials (NiSe2, MoS2, MoS2/NiSe2 composite, and CQDs/MoS2/NiSe2 composite). Structures and electrochemical performance were investigated. Among the four kinds of electrode materials, CQDs/MoS2/NiSe2 composite has excellent performance. The specific capacitance of the CQDs/MoS2/NiSe2 composite can be as high as 1540.7 F g−1 at a current density of 5 A g−1, which is higher than that of NiSe2 (830.9 F g−1), MoS2 (82.2 F g−1) and MoS2/NiSe2 composite (1289.7 F g−1). After 2000 cycles, the specific capacitance of the CQDs/MoS2/NiSe2 composite can be retained by 80.6% at 20 A g−1, indicating its good cycling stability. The experiment results show that the CQDs/MoS2/NiSe2 composite has promising electrochemical energy storage application in supercapacitors.

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Acknowledgements

The work was funded by the National Natural Science Foundation of China (Grant No. 21607013, 51602026), the Natural Science Basic Research Plan in Shaanxi Province of China (2020JM-221), the Fund Project of Shaanxi Key Laboratory of Land Consolidation (2018-JC01), the Fundamental Research Funds for the Central Universities, CHD (300102310203) and College Students’ innovation and Entrepreneurship Project (201810710127, 201910710466).

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Correspondence to Jiahong Zheng or Kangkang Cheng.

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Zheng, J., Cheng, K., Zhang, R. et al. Hydrothermal preparation of CQDs/MoS2/NiSe2 composite as electrode material for supercapacitor. J Mater Sci: Mater Electron 31, 9366–9376 (2020). https://doi.org/10.1007/s10854-020-03476-7

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  • DOI: https://doi.org/10.1007/s10854-020-03476-7

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