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. 2023 Oct 20;15:232. doi: 10.1007/s40820-023-01195-2

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Normalized a Fe and g Co K-edge XANES spectra of synthesized catalysts and standard samples. Comparison is made for the magnitude and the imaginary part of the Fourier transform of b Fe and h Co between the experimental and the Feff modeling. The Fourier transforms of c Fe and i Co K-edge EXAFS oscillations k³χ(k) of different catalysts. d–f Fe K-edge wavelet transforms (WT)-EXAFS contour plots of d Fe/Co-SAs/NC, e Fe/Co-CTs/NC, and f Fe/Co-NPs/NC. j-l Co K-edge WT-EXAFS contour plots of j Fe/Co-SAs/NC, k Fe/Co-CTs/NC, and l Fe/Co-NPs/NC