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. 2022 Jan 25;13:484. doi: 10.1038/s41467-022-28146-6

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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, b FESEM images of the Ir-FeCoO_x/BiVO₄ with different magnification times. c–i Structural characterizations of the FeCoO_x/BiVO₄ sample together with references: c Normalized Fe K-edge XANES μ(E) spectra. d Normalized Co K-edge XANES μ(E) spectra. e Fe K-edge and Co K-edge radial distance χ(R) space spectra. f Fourier-transformed (FT)-Extended X-ray absorption fine structure (EXAFS) fitting curves at R space of Fe K-edge. g FT-EXAFS fitting curves at R space of Co K-edge. h Fe K-edge 3D contour wavelet transform. i Co K-edge 3D contour wavelet transform.