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. 2021 Mar 1;12:1369. doi: 10.1038/s41467-021-21595-5

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© The Author(s) 2021

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. 3 — a Ru K-edge XANES spectra of NiRu_0.13-BDC, Ru foil and RuO₂. b Relationship between Ru K-edge threshold value (E₀) and oxidation state for NiRu_0.13-BDC and two reference materials. c Fourier transformed EXAFS spectra of Ru foil, RuO₂ and NiRu_0.13-BDC. d Ni K-edge XANES spectra of Ni-BDC and NiRu_0.13-BDC.