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. 2022 Feb 10;13:819. doi: 10.1038/s41467-022-28456-9

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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 Comparison of adsorption energy and hydrogenation of *CO on various single-atom catalytic sites. b Catalytic methane activities of pristine Cu vs. various single-atom-anchored copper catalysts for CO₂ reduction reaction. c Effect of iron domain sizes in the copper surface on the adsorption energies of *H and *CO. d Catalytic activities of various iron-dispersed copper materials, including nanoparticle, cluster, and single-atom forms. The error bars represent 1 s.d. on the basis of three independent samples.