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NiCoO2/NiCoP@Ni nanowire arrays: tunable composition and unique structure design for high-performance winding asymmetric hybrid supercapacitors

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Abstract

Transition metal phosphides (TMPs) are recognized as such promising supercapacitor materials for the practical application, due to their superior electrical conductivity and excellent redox activity. Here, self-supported three-dimensional NiCoP nanoparticles embedded in NiCoO2 nanowires (NiCoO2/NiCoP) electrode consisting of nickel cobalt phosphides (NiCoP) with high activity and nickel cobalt oxides (NiCoO2) with good stability were fabricated by a hydrothermal and phosphorization method. The electrode integrates the advantages of nanowire arrays for fast ion transport and foam Ni for effective charge transport and flexibility. Benefitting the proper composition control of the nanohybrid and unique structure design, the optimized NiCoO2/NiCoP-20 exhibits a high specific capacitance of 3204 F·g−1 at 1 A·g−1 in 3 mol·L−1 KOH aqueous electrolyte in a three-electrode system. Moreover, the asymmetric supercapacitor assembled with the prepared NiCoO2/NiCoP-20 and activated carbon achieves a specific capacitance of 116 F·g−1 with a high energy density of 40.32 Wh·kg−1 at the power density of 800.18 W·kg−1. The practical application is further demonstrated with all-solid-state winding supercapacitor devices, with decent flexibility, in series to light the Central South University (CSU) logo consisting of 21 red LED indicators.

Graphic abstract

The NiCoO2/NiCoP-20 combines the superior electrical conductivity and preeminent redox activity of NiCoP and excellent electrochemical stability of NiCoO2 together, which performed the best electrochemical performance.

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Acknowledgements

This research was financially supported by the National Key Research and Development Program of China (No. 2018YFB0104200).

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Wei-Wei Ning, Li-Bao Chen, Wei-Feng Wei, Yue-Jiao Chen & Xiao-Yong Zhang

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  1. Wei-Wei Ning
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  2. Li-Bao Chen
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  3. Wei-Feng Wei
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Correspondence to Yue-Jiao Chen or Xiao-Yong Zhang.

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Ning, WW., Chen, LB., Wei, WF. et al. NiCoO2/NiCoP@Ni nanowire arrays: tunable composition and unique structure design for high-performance winding asymmetric hybrid supercapacitors. Rare Met. 39, 1034–1044 (2020). https://doi.org/10.1007/s12598-020-01374-9

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