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. 2020 Oct 29;13:13. doi: 10.1007/s40820-020-00522-1

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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. 14 — a Schematic illustration of the synthesis of 1D/2D C₃N₄/rGO composite via a hydrothermal/freeze-drying method. Reproduced with permission from Ref. [54]. b Scheme illustrating suggested potassiation and depotassiation mechanism of the Co₃O₄@N–C electrode. Reproduced with permission from Ref. [108]. Copyright permission from Elsevier and American Chemical Society. (Color figure online)