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. 2022 Mar 11;13:1322. doi: 10.1038/s41467-022-29035-8

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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. 1 — a TEM image of Cu/N_0.14C. b HAADF-STEM image of Cu/N_0.14C. c EDS of Cu/N_0.14C. d XRD of Cu/N_0.14C, Cu/C and NC. e Cu K-edge XANES spectra of Cu/N_0.14C with the references. f FT-EXAFS spectra of Cu/N_0.14C with the references. g XPS analysis of the Cu 2p_3/2 for Cu/N_0.14C and Cu/C. h AES analysis of the Cu L3M45M45 for Cu/N_0.14C and Cu/C. i N K-edge XANES spectra of Cu/N_0.14C and N_0.14C.