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Facile synthesis of mesoporous ZnCo2O4 nanosheet arrays grown on rGO as binder-free electrode for high-performance asymmetric supercapacitor

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Abstract

Asymmetric supercapacitor (ASC) with high energy density has been developed successfully using rGO/ZnCo2O4 composite as positive electrode and activated porous carbon (AC) derived from lotus leaves as negative electrode in KOH solution. Mesoporous ZnCo2O4 nanosheet arrays grown on rGO were prepared via a simple hydrothermal method followed by calcination. RGO/ZnCo2O4 composite exhibited excellent electrochemical performance, which can achieve a specific capacity of 680 F g−1 at current density of 1 A g−1. Due to the high capacitance of porous rGO/ZnCo2O4 nanosheet structure and synergistic effect between the positive and negative electrodes, the RGO/ZnCo2O4//AC ASC showed excellent performance with high specific capacitance of 110 F g−1 at 0.5 A g−1 and good cycling stability with only 2.7% loss of available specific capacitance after 3000 cycles. More importantly, the maximum energy density of this ASC can achieve 31.25 W h kg−1 at a power density of 375 W kg−1. In addition, this ASC can store charge efficiently and two ASCs in series can light up a LED, which can last for over 15 min. These encouraging results show its great potential in the application of energy storage devices.

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Acknowledgements

This work was financially supported by the Fundamental Research Funds for the Central Universities (No. 2017QNA04).

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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

    Jiqiu Qi, Anbang Zhang, Liyang Jiang, Yanwei Sui, Yezeng He, Qingkun Meng, Fuxiang Wei & Xuping Zhang

  2. 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

  3. 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

  4. School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China

    Jingwen Mao

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  1. Jiqiu Qi
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Correspondence to Yanwei Sui or Xuping Zhang.

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Qi, J., Mao, J., Zhang, A. et al. Facile synthesis of mesoporous ZnCo2O4 nanosheet arrays grown on rGO as binder-free electrode for high-performance asymmetric supercapacitor. J Mater Sci 53, 16074–16085 (2018). https://doi.org/10.1007/s10853-018-2757-7

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