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. 2020 Jan 17;11:357. doi: 10.1038/s41467-019-14199-7

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© The Author(s) 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. 3 — a Photograph of MC, MCC, MC-r, and OxgeMCC-r SAE. b Powder XRD of corresponding materials. c Enlarged powder XRD (2θ from 16 to 18 degree) of b. d HAADF-STEM image and corresponding EDS elemental mapping (Mn, Co, Ru, N, O, and C elements) of OxgeMCC-r SAEs. Scale bar is 100 nm. e C 1s XPS spectrum magnified from Supplementary Figs. 1 and 3. Inset is the enlarged Ru 3d spectrum of MC-r. f C K-edge NEXAFS spectra of MC and MC-r. g N K-edge NEXAFS spectra of MC and MC-r.