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Sulfur-vacancies promoted performance of hierarchical NiCo2S4 nanotubes through electrospinning for supercapacitors

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Abstract

In this work, one-dimensional (1D) NiCo2S4 nanotubes with sulfur vacancies (Vc-NiCo2S4) were designed effectively via the electrostatic spinning and chemical bath deposition (CBD) process. As-spun polyacrylonitrile (PAN) nanofibers containing surfactant were taken as hard templates. Through the in-situ growth and etching process, NiCo2S4 nanotubes covered with a large number of nanosheets were generated. Sulfur vacancies were introduced by the following chemical reduction. The influence of defects was systematically discussed through structure analyses and electrochemical properties. As-obtained Vc-NiCo2S4 not only maintains the original hierarchical nanotube characteristic, but also boost the electrochemical behaviors. Due to the defect treatment, Vc-NiCo2S4 nanotubes have a higher specific capacity (1046 F g−1 at a current density of 1 A g−1) and enhanced rate capability. A symmetrical supercapacitor (SSCs) device assembled by Vc-NiCo2S4 nanotubes displays a high energy density of 31.8 Wh kg−1 at the power density of 260 W kg−1. These results indicate that the construction of 1D hierarchical nanotubes and sulfur vacancies could provide effective strategy to promote the performance of supercapacitors.

Graphical abstract

1D NiCo2S4 hierarchical nanotubes were prepared by employing PAN nanofibers as sacrificial templates. The Vc-NiCo2S4 nanotubes after NaBH4 reduction maintain the original morphology and optimize the electrochemical activities. Vc-NiCo2S4 with sulfur vacancies exhibits enhanced electrochemical performance.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China (NSFC 51602289).

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Authors and Affiliations

  1. Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, No. 75, Daxue Road, Zhengzhou, 450052, China

    Ying Zhang, Li Ye, Jiahui Guo, Yuanyuan Shang, Fengmei Guo, Yingjiu Zhang & Jie Xu

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  1. Ying Zhang
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  2. Li Ye
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  3. Jiahui Guo
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Correspondence to Jie Xu.

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Zhang, Y., Ye, L., Guo, J. et al. Sulfur-vacancies promoted performance of hierarchical NiCo2S4 nanotubes through electrospinning for supercapacitors. J Mater Sci 56, 9368–9381 (2021). https://doi.org/10.1007/s10853-021-05874-6

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