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. 2018 Feb 28;10(3):40. doi: 10.1007/s40820-018-0194-4

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 6 — a TEM image and b HRTEM image of FeS₂@C with 45-minute etching. Element mapping images of: c FeS₂@C-0 and d FeS₂@C-45. e Comparison of rate performance of FeS₂@C-0 and FeS₂@C-45 at various current densities. f Variation of capacity retention of FeS₂@C-0 and FeS₂@C-45 in 100 cycles performance at 100 mA g⁻¹. g Long-term cyclic performance of FeS₂@C-0 and FeS₂@C-45. Reprinted with permission from Ref. [86]