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Published in: Journal of Materials Science 15/2021

16-02-2021 | Energy materials

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

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

Published in: Journal of Materials Science | Issue 15/2021

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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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Appendix
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Metadata
Title
Sulfur-vacancies promoted performance of hierarchical NiCo2S4 nanotubes through electrospinning for supercapacitors
Authors
Ying Zhang
Li Ye
Jiahui Guo
Yuanyuan Shang
Fengmei Guo
Yingjiu Zhang
Jie Xu
Publication date
16-02-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 15/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-05874-6

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