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. 2021 Oct 11;13:208. doi: 10.1007/s40820-021-00734-z

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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. 12 — a Schematic illustration for the formation process and the synthetic mechanism of NC@Co/NC carbon nanocages, b, c 3D RL map and RL map of NC@Co/NC carbon nanocages.

Reproduced with permission from Ref. [179]. Copyright © 2020 Elsevier B.V. d Schematic illustration for the synthesis process of hollow CoMo@HNCP polyhedron, e RL values of CoMo@HNCP. Reproduced with permission from Ref. [178]. Copyright © 2020 Elsevier Ltd. f Schematic formation process of the composites. Reproduced with permission from Ref. [182]. Copyright © 2020 Elsevier B.V.