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. 2022 Sep 17;14:190. doi: 10.1007/s40820-022-00927-0

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© The Author(s) 2022

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. 2 — Structural characterizations of PEMAC@NDCN. a SEM image and b STEM image of PEMAC@NDCN free-standing catalysts. c High-resolution STEM image. d Topographic interplanar spacing profiles of stated cyan region in (c). e Enlarged HRTEM image defining hexagonal crystal structure. f SAED pattern along with different crystal orientations. g HAADF-STEM image with elemental maps of C, N, and O in the PEMAC@NDCN. Scale bars, a 500 nm, b 300 nm, and g 50