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. 2021 Jan 12;12:303. doi: 10.1038/s41467-020-20619-w

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© The Author(s) 2021

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Schematic illustration of the formation of single-atom catalyst with atomically dispersed Co sites and polarized supports. b TEM image of Co SAs/BCN. c, f HAADF-STEM image of Co SAs/BCN (inset: SAED image). d 3D isolines and atom-overlapping Gaussian-function fitting mapping of the square from f and intensity profile along X–Y in f. e EELS element mapping. g Synchrotron X-ray three-dimensional computed tomographic images of Co SAs/BCN.