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Sulfidation of cobalt nickel oxide nanofibers for improving their specific capacity

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Abstract

An electrospinning method was used to synthesize the Co3O4/NiO nanofibers, which then was sulfurized by solvothermal method in order to improve their electrochemical properties. The SEM pictures showed that sulfurized Co3O4/NiO nanofibers were irregular short nano-rods consisting of nanocrystalline particles; the BET tests showed that sulfuration is beneficial to improve the specific surface area of the fibers; the XPS showed that the existence of the valence state: Co2+, Co3+, Ni2+, Ni3+ and S2− in sulfurized sample, which was confirmed by XRD as Co3S4 and Ni0.96S, respectively. Especially, electrochemical tests showed that the sulfurized Co3O4/NiO nanofibers electrode delivers high specific capacity of 156.84 mA h g−1 at 1 A g−1 and 151.07 mA h g−1 at 10 A g−1 and after 1000 cycles, its capacity retention reaches 87.3% at 5 A g−1. The mechanism of improving the electrochemical performance after sulfidation was also discussed in detail.

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Acknowledgements

This research is supported by “the Fundamental Research Funds for the Central Universities (no. 2017XKZD08)”.

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Authors and Affiliations

  1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, People’s Republic of China

    Sheng Zhang, Yabo Zhu, Xiaotong Tang, Chao Shi, Xiuquan Gu & Dekun Zhang

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  1. Sheng Zhang
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  2. Yabo Zhu
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  3. Xiaotong Tang
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  4. Chao Shi
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  5. Xiuquan Gu
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  6. Dekun Zhang
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Correspondence to Yabo Zhu.

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Zhang, S., Zhu, Y., Tang, X. et al. Sulfidation of cobalt nickel oxide nanofibers for improving their specific capacity. J Mater Sci: Mater Electron 29, 20800–20807 (2018). https://doi.org/10.1007/s10854-018-0222-7

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  • DOI: https://doi.org/10.1007/s10854-018-0222-7

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