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Graphene In Situ Coated High-Oxygen Vacancy Co3O4−x Sphere Composites for High-Stability Supercapacitors

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Abstract

In this paper, the graphene in situ coated Co3O4 core–shell heterogeneous composites have been facilely fabricated via microwave plasma-enhanced chemical vapor deposition method. The graphene thin-shell-layer-covered Co3O4−x particles were revealed by FE-SEM, XRD, XPS and Raman spectra. And the ratio of Co2+/Co3+ is adjusted, and abundant surface oxygen vacancies are created by the microwave plasma etching, which can contribute to the improvement of electrochemical performance for the Co3O4/graphene core–shell composites. Results present that the graphene in situ coated Co3O4−x has a specific capacitance of 192.8 F g−1 under the current density of 0.5 A g−1, which is 4.5 times than that of the original Co3O4 sphere. Meanwhile, the core–shell heterogeneous composite displays excellent cyclic stability with ~ 98.5% specific capacitance retained after 20,000 cycle tests.

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Acknowledgements

This research was funded by National Natural Science Foundation of China, No. 51864028; the Applied Basic Research Fund Project of Yunnan Province, Nos. 2018FD053 and 2018FA029; Yunnan Province Funds for Distinguished Young Scientists, No. 2019FJ005; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project, No. YNWRQNBJ-2018-311; Science Research Foundation of Yunnan Provincial Education Department, No. 2018JS306.

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Correspondence to Shenghui Guo or Tu Hu.

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Duan, Y., Yang, L., Gao, J. et al. Graphene In Situ Coated High-Oxygen Vacancy Co3O4−x Sphere Composites for High-Stability Supercapacitors. Arab J Sci Eng (2020). https://doi.org/10.1007/s13369-020-04337-5

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Keywords

  • Co3O4
  • MPCVD
  • Graphene
  • Supercapacitor
  • Plasma etching