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Flower-like NiO microspheres prepared by facile method as supercapacitor electrodes

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Abstract

Hierarchical flower-like NiO microsphere was successfully synthesized by a simple one-step template-free hydrothermal process, using l-lysine as precipitator and nickel sulfate as nickel source. The as-synthesized materials were characterized by X-ray diffraction, field emission scanning electron microscope, high-resolution transmission electron microscope, and the electrochemical workstation. The electrochemical results show that the flower-like NiO microspheres exhibit specific capacitance as large as 324 F g−1 at the current density of 2 A g−1 and the specific capacitance retention can maintain 83 % after 1,000 cycles at the current density of 20 A g−1 in 6 M KOH.

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Acknowledgments

This work was supported by Tongji University Research Foundation (1380219039). The authors would like to thank the colleagues from the Chemistry Experimentation Center of Tongji University for their help in the sample characterization.

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Authors and Affiliations

  1. Department of Chemistry, Tongji University, 1239 Siping Road, Shanghai, 200092, People’s Republic of China

    Qingfeng Wu, Yafei Liu & Zhonghua Hu

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  1. Qingfeng Wu
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  2. Yafei Liu
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  3. Zhonghua Hu
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Correspondence to Qingfeng Wu.

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Wu, Q., Liu, Y. & Hu, Z. Flower-like NiO microspheres prepared by facile method as supercapacitor electrodes. J Solid State Electrochem 17, 1711–1716 (2013). https://doi.org/10.1007/s10008-013-2022-6

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  • DOI: https://doi.org/10.1007/s10008-013-2022-6

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