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. 2023 Nov 8;14:7210. doi: 10.1038/s41467-023-42756-8

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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. 4 — a XANES spectra, b q-space magnitude comparisons, and c WT-EXAFS at Co K-edge of Co foil, CoO, CoPc, Co_SA-N-HCS-900, and Co₂-N-HCS-900; d, e k³-Weighted EXAFS fitting curves at R space for Co_SA-N-HCS-900 and Co₂-N-HCS-900 (inset: schematic structure of CoN₄ and Co₂N₅ models; green: Co, blue: N, red: O); f X-band electron paramagnetic resonance (EPR) spectra and g magnetic hysteresis loops at room temperature (300 K) and inset image of the magnification of magnetic hysteresis loops around H = 0; h M-T curves and i corresponding unpaired electron n and effective magnetic moment (μ_eff) for Co_SA-N-HCS-900 and Co₂-N-HCS-900. j Work function spectra for Co_NP/HCS-900, Co_SA-N-HCS-900, and Co₂-N-HCS-900.