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. 2021 May 29;13:131. doi: 10.1007/s40820-021-00659-7

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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. 4 — a Second discharge/charge cycle and the corresponding voltage position, b ex situ Raman spectra at 0.2 A g⁻¹, c corresponding I_D/I_G ratio, d ex situ XRD patterns, e HRTEM at fully discharged, f HAADF-STEM image, g elemental mappings, and h HRTEM at fully charged of Se/N-3DMpC. i Galvanostatic intermittent titration technique (GITT) curves of Se/N-3DMpC and Se-3DMpC at the 200th cycles. The K-ion diffusion coefficient of j Se/N-3DMpC and k Se-3DMpC calculated by the GITT during potassiation and depotassiation processes