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. 2022 Jun 29;13:3754. doi: 10.1038/s41467-022-31427-9

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© The Author(s) 2022

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 HAADF–STEM image with EDS elemental mappings and b high resolution STEM image of dCu₂O/Ag_2.3%. c Enlarged XRD patterns for dCu₂O, dCu₂O/Ag_2.3% and dCu₂O/Au_2.3%. d In situ XANES spectra and e Wavelet transform images of EXAFS data with optimized Morlet parameter (i.e., κ = 5, σ = 1) at Cu K-edge for commercial Cu-foil, dCu₂O, dCu₂O/Ag_2.3% and dCu₂O/Au_2.3%. Fourier transform curves of in situ EXAFS data and corresponding fitted results (first coordination shell) for f dCu₂O, g dCu₂O/Ag_2.3% and h dCu₂O/Au_2.3%. Scale bars, 10 nm in (a) and 1 nm in (b).