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Hierarchical NiCo2O4/MnO2 core–shell nanosheets arrays for flexible asymmetric supercapacitor

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Abstract

Rational construction of binder-free electrode is regarded as a promising way to improve the electrochemical performance of supercapacitor. Herein, we synthesize a hierarchical NiCo2O4/MnO2 core–shell nanosheets arrays by two-step cathodic electrodeposition method. The optimized NiCo2O4/MnO2 electrode prepared by the electrodeposition potential of − 1.8 V for 240 s shows a large specific capacitance of 3.81 F cm−2 at 2 mA cm−2. The enhanced electrochemical performance is attributed to the unique core–shell structure of NiCo2O4/MnO2 nanosheets arrays with appropriate interspaces between nanosheets that can offer more active sites and accelerate ion/electron transfer rate. Besides, the NiCo2O4/MnO2//AC flexible asymmetric supercapacitor achieves a high energy density of 2.55 mWh cm−3 with good stability (86.1% of initial capacitance can remain after 10000 cycles), indicating the perfect energy storage features.

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Data availability statement

All data included in this study are available upon request by contact with the corresponding author.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51772072, 51672065, 51701057), the Natural Science Foundation of Anhui Province (1708085ME100), the Fundamental Research Funds for the Central Universities (PA2019GDQT0022, PA2019GDQT0015, JZ2019HGBZ0142). We would also like to thank the financial support from the 111 Project “New Materials and Technology for Clean Energy” (B18018).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China

    Jianfang Zhang, Yan Wang, Cuiping Yu, Tianyu Zhu, Yang Li, Jiewu Cui, Xia Shu, Yongqiang Qin, Jian Sun, Jian Yan, Yong Zhang & Yucheng Wu

  2. Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA

    Jianfang Zhang & Jingjie Wu

  3. China International S&T Cooperation Base for Advanced Energy and Environmental Materials, Hefei, 230009, China

    Xia Shu, Yongqiang Qin, Jian Sun, Yong Zhang & Yucheng Wu

  4. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials, Hefei, 230009, China

    Jian Yan & Yucheng Wu

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  1. Jianfang Zhang
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Zhang, J., Wang, Y., Yu, C. et al. Hierarchical NiCo2O4/MnO2 core–shell nanosheets arrays for flexible asymmetric supercapacitor. J Mater Sci 55, 688–700 (2020). https://doi.org/10.1007/s10853-019-03988-6

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