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. 2021 Oct 26;12:6194. doi: 10.1038/s41467-021-26542-y

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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. 1 — a HAADF-STEM images of Pd₁/ND@G at low magnification. b Atomically dispersed single Pd atoms in Pd₁/ND@G highlighted by the yellow circles. c HAADF-STEM images of Pd_n/ND@G at low magnification. d Fully exposed Pd clusters in Pd_n/ND@G highlighted by the red circles. e Pd K-edge XANES profiles and f EXAFS spectra for Pd₁/ND@G and Pd_n/ND@G. Scale bars: a, 5 nm; b, d, 2 nm; c, 20 nm.