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Self-assembled NiCo2O4 microspheres for hybrid supercapacitor applications

  • Energy materials
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Abstract

Hierarchical NiCo2O4 microspheres self-assembled by nanorods, nanosheets and nanoparticles were prepared through hydrothermal and calcination processes. By changing solvents and/or additives during hydrothermal process, the nanostructures in NiCo2O4 microspheres were regulated. Among the as-prepared samples, nanosheets-assembled NiCo2O4 microspheres (NCO-S) exhibited the highest specific capacitance of 667.6 F g−1 at current density of 1 A g−1 and possessed good cycling stability of 85.2% capacity retention rates for 3000 cycles. The excellent electrochemical performance was attributed to its hierarchical nanostructures, high specific surface area and improved electric conductivity. Furthermore, the hybrid supercapacitor with NCO-S as positive electrode and reduced graphene oxide as negative electrode delivered a prominent energy density of 26.2 Wh kg−1 at power density of 920.8 W kg−1 and excellent capacity retention of 99.4% for 5000 cycles.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities of China (No.2019ZDPY22).

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Authors and Affiliations

  1. School of Materials and Physics, China University of Mining and Technology, Xuzhou, 221116, People’s Republic of China

    Hanzhuo Zhang, Jinxun Han, Jingzheng Xu, Yihan Ling & Xuemei Ou

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  1. Hanzhuo Zhang
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  2. Jinxun Han
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Correspondence to Hanzhuo Zhang.

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Zhang, H., Han, J., Xu, J. et al. Self-assembled NiCo2O4 microspheres for hybrid supercapacitor applications. J Mater Sci 57, 5566–5576 (2022). https://doi.org/10.1007/s10853-022-06967-6

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