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

  • Jianfang Zhang
  • Yan WangEmail author
  • Cuiping Yu
  • Tianyu Zhu
  • Yang Li
  • Jiewu Cui
  • Jingjie WuEmail author
  • Xia Shu
  • Yongqiang Qin
  • Jian Sun
  • Jian Yan
  • Yong Zhang
  • Yucheng Wu
Energy materials
  • 19 Downloads

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.

Notes

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).

Supplementary material

10853_2019_3988_MOESM1_ESM.doc (1.4 mb)
Supplementary material 1 (DOC 1430 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringHefei University of TechnologyHefeiChina
  2. 2.Department of Chemical and Environmental EngineeringUniversity of CincinnatiCincinnatiUSA
  3. 3.China International S&T Cooperation Base for Advanced Energy and Environmental MaterialsHefeiChina
  4. 4.Key Laboratory of Advanced Functional Materials and Devices of Anhui ProvinceAnhui Provincial International S&T Cooperation Base for Advanced Energy MaterialsHefeiChina

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