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Facile synthesis of hierarchical NiCoP nanowires@NiCoP nanosheets core–shell nanoarrays for high-performance asymmetrical supercapacitor

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Abstract

Transition metal phosphides have been regarded as reliable supercapacitor electrode materials and extensively researched. In this work, a facile three-step way has been taken to synthesize NiCoP@NiCoP core–shell nanoarrays directly grown on carbon cloth, which was used as a high-performance supercapacitor electrode. Compared with the NiCo-LDH precursor and NiCoP nanowire and NiCoP nanosheet, NiCoP@NiCoP core–shell composite shows higher electrochemical performance owing to the integration of the advantages of phosphides and core–shell structure. To be specific, the as-fabricated NiCoP C–S electrode exhibits great electrochemical performance with high specific capacitance (1492.5 F g−1 at 1 A g−1), good rate performance (68.82% of the initial specific capacitance at 15 A g−1) and outstanding cycling stability (maintains 80.9% of the initial capacitances after 5000 cycles at 10 A g−1). Moreover, the assembled NiCoP C–S//rGO asymmetric supercapacitor device delivers a high energy density of 48.13 Wh kg−1 at the power density of 1125 W kg−1 and it still retains 20.94 Wh kg−1 at a high power density of 11250 W kg−1, indicating its great possibility of practical application.

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Acknowledgements

This work was financially supported by the Fundamental Research Funds for the Central Universities (No. 2019XKQYMS06).

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Authors and Affiliations

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

    Qingsong Liu, Jiqiu Qi, Yanwei Sui, Yezeng He, Qingkun Meng, Fuxiang Wei & Yaojian Ren

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian, 710072, People’s Republic of China

    Rui Hu

  3. Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou, 221116, People’s Republic of China

    Jiqiu Qi, Yanwei Sui & Fuxiang Wei

  4. Xuzhou City Key Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou, 221116, People’s Republic of China

    Jiqiu Qi, Yanwei Sui & Fuxiang Wei

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  1. Qingsong Liu
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Liu, Q., Hu, R., Qi, J. et al. Facile synthesis of hierarchical NiCoP nanowires@NiCoP nanosheets core–shell nanoarrays for high-performance asymmetrical supercapacitor. J Mater Sci 55, 1157–1169 (2020). https://doi.org/10.1007/s10853-019-04011-8

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