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. 2020 Mar 24;11:1532. doi: 10.1038/s41467-020-15261-5

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© The Author(s) 2020

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 TEM image of Mo₁/Fe₂O₃. b AC-STEM, and c–f EDX mapping images of the selected area (black dashed rectangle) in a. g AC-STEM image of Mo₁/Fe₂O₃. h Intensity surface plot and the corresponding structural model of the selected area (white dashed rectangle) in g. The Mo loading is 1.3 wt% with respect to α-Fe₂O₃. The purple, red, yellow, and brown balls represent Mo atoms, O atoms, surface Fe atoms (Fe_surf), and subsurface Fe atoms (Fe_sub), respectively. Selected single Mo atoms and dinuclear Mo₁-Fe₁ sites are marked by the yellow circles and the red ellipses, respectively.