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. 2020 Aug 6;11:3908. doi: 10.1038/s41467-020-17738-9

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 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. 4 — a HAADF-STEM image of Pd₁@HEFO and b corresponding EDS mapping of Pd. c Schematic model of Pd₁@HEFO (220). d XANES spectra at the Pd K-edge. e The k³-weighted Fourier transforms of Pd K-edge EXAFS spectra, and f the wavelet transforms from experimental data for Pd₁@HEFO, PdO, and Pd foil. Source data are provided as a Source data file.