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. 2023 Nov 8;14:7210. doi: 10.1038/s41467-023-42756-8

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© The Author(s) 2023

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 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 — a Schematic diagram of the NP-to-SA-to-DA atomization and sintering strategy. b TEM, c HRTEM, d HAADF-STEM, and e C, O, N, Co elemental mapping images; f, g AC HAADF-STEM images (Co single atoms marked by red circles); h, i 3D atom-overlapping Gaussian-function fitting map in g for Co_SA-N-HCS-900. j TEM, k HRTEM, l HAADF-STEM, and m C, O, N, Co elemental mapping images; n, o AC HAADF-STEM images (Co dual atoms marked by red circles); p, q 3D atom-overlapping Gaussian-function fitting map in o for Co₂-N-HCS-900.