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. 2020 Oct 28;13:12. doi: 10.1007/s40820-020-00541-y

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© The Author(s) 2020

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. 9 — Schematic diagram of K⁺ trapped a in the surface and b in the defect sites. Reproduced with permission from Ref. [65]. Copyright 2018, Elsevier. c Schematic diagram and d TEM image of PODG. e The rate capability of the PODG electrode. f Cycle capacities of the obtained anode under three different current densities. Reproduced with permission from Ref. [66]. Copyright 2017, Royal Society of Chemistry