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. 2020 May 4;11:2191. doi: 10.1038/s41467-020-15712-z

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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. 2 — SEM images of N-HP-Co SACs, 1 μm in (a), 200 nm in (b); c TEM image of N-HP-Co SACs. d HAADF-STEM image, 50 nm in (d); and the corresponding elemental maps. e HAADF-STEM image, 5 nm in (e), f enlarged image of N-HP-Co SACs, 2 nm in (f); g PXRD graphs of N-HP-Co NPs and Co-SACs. h High-resolution N 1s XPS spectra of N-HP-Co SACs. i N₂ adsorption-desorption isotherms of N-HP-Co NPs and Co SACs at 77 K. BET: 80.5 cm³ g⁻¹ with N-HP-Co NPs; 312.3 cm³ g⁻¹ with N-HP-Co SACs.