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Electrochemical performance of mesoporous ZnCo2O4 nanosheets as an electrode material for supercapacitor

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Abstract

The mesoporous ZnCo2O4 nanosheets were synthesized via a facile hydrothermal method and subsequent thermal annealing treatment. The sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorption/desorption isotherms (BET) to obtain information about its crystal structure, morphology, and BET surface area, respectively. The nanosheets present hexagonal shape with mesoporous structure in nature. The obtained mesoporous ZnCo2O4 nanosheets exhibit a high specific surface area of 191.64 m2/g. The electrochemical properties of the mesoporous ZnCo2O4 nanosheets were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) in 6 mol/L KOH aqueous electrolyte. The ZnCo2O4 nanosheets show a high specific capacity of 835.26 F/g at the current density of 1.0 A/g, as well as good cycle stability with specific capacitance remaining 73.28% of the initial value after 1000 continuous charge-discharge cycles under the current density of 8 A/g. These superior electrochemical features demonstrate that the mesoporous ZnCo2O4 nanosheet is a promising electroactive material for supercapacitor.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 51262029) and Program for Excellent Young Talents, Yunnan University.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Yunnan University, Kunming, 650091, People’s Republic of China

    Xuechun Xiao, Mengmeng Zhang & Yude Wang

  2. Key Lab of Micro-Nano Materials and Technology of Yunnan Province, Yunnan University, Kunming, 650091, People’s Republic of China

    Xuechun Xiao, Guofeng Wang & Yude Wang

  3. Department of Physics, Yunnan University, Kunming, 650091, People’s Republic of China

    Zhezhe Wang & Rongjun Zhao

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  1. Xuechun Xiao
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  2. Guofeng Wang
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  3. Mengmeng Zhang
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  5. Rongjun Zhao
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  6. Yude Wang
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Correspondence to Yude Wang.

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Xiao, X., Wang, G., Zhang, M. et al. Electrochemical performance of mesoporous ZnCo2O4 nanosheets as an electrode material for supercapacitor. Ionics 24, 2435–2443 (2018). https://doi.org/10.1007/s11581-017-2354-9

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