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. 2021 Dec 6;14:17. doi: 10.1007/s40820-021-00741-0

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 10 — Nyquist plots of of FeSe_x@C/MB and FeSe_x/MB: a fresh cells, b, c after the 1st, 80th, and 160th cycle, and d the relationship between the phase angle (ω^−1/2) and impedance (Z’) at the 160th cycle