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ZnCo2O4@MnCo2O4 heterojunction structured nanosheets for high-performance supercapacitor

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Abstract

ZnCo2O4@MnCo2O4 heterojunction structured nanosheets were successfully prepared by simple and effective hydrothermal reaction. The obtained heterojunction structured had large specific surface area, good structural stability, and excellent electrical conductivity. Therefore, they were expected to become ideal electrochemical materials. As expected, a series of electrochemical tests showed ZnCo2O4@MnCo2O4 heterojunction structured nanosheets demonstrate high specific capacitance (254 F g−1 at the current density of 1 A g−1). Good stability of charge–discharge, when the current density was 10 A g−1, the capacity can still maintain 186 F g−1. Especially, the maximum energy density of asymmetric supercapacitors based on ZnCo2O4@MnCo2O4 and activated carbon at 750 W Kg−1 was 19.12 Wh Kg−1, and the cycle stability was good, after 2000 cycles, the capacitance retention rate was 98.5%. For practice application, the commercial LED lights can be lighted by two supercapacitor units in series. It shows that the synthetic electrode material has great potential in the energy storage equipment.

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Acknowledgements

The authors acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 51402082), the Natural Science Foundation of Hebei Province (Grant No. E2015402058) and Program for the Top Young Talents of Higher Learning Institutions of Hebei Province (Grant Nos. BJ2014018 and BJ2014016).

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Authors and Affiliations

  1. Institute of Novel Materials for Energy and Environment, College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, People’s Republic of China

    Lei Wang, Yuming Guan, Xiaolei Zhao, Jingbo Mu, Hongwei Che, Huanhuan Li & Zengcai Guo

Authors
  1. Lei Wang
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  2. Yuming Guan
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  3. Xiaolei Zhao
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  4. Jingbo Mu
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  5. Hongwei Che
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  6. Huanhuan Li
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  7. Zengcai Guo
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Correspondence to Zengcai Guo.

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Wang, L., Guan, Y., Zhao, X. et al. ZnCo2O4@MnCo2O4 heterojunction structured nanosheets for high-performance supercapacitor. J Mater Sci: Mater Electron 29, 5782–5790 (2018). https://doi.org/10.1007/s10854-018-8549-7

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  • DOI: https://doi.org/10.1007/s10854-018-8549-7

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