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. 2018 Mar 8;8:4194. doi: 10.1038/s41598-018-22622-0

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) CV curves at 10 mV s⁻¹, (b,c) CV curves at different scan rates, and (d) charge-discharge curves at 4 A g⁻¹ of the pristine Bi₂S₃ and C@Bi₂S₃ samples at 8 h; (e) charge-discharge curves of the C@Bi₂S₃ sample at 8 h at different current densities, and (f) EIS spectra of pristine Bi₂S₃ and C@Bi₂S₃ samples at 8 h.