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. 2020 Jan 30;11:593. doi: 10.1038/s41467-020-14402-0

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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 — a The water contact angles of NiSA/PCFM spraying with a little amount of Nafion solution. b Cross-sectional and c high-resolution SEM images of NiSA/PCFM. d HR-TEM image of NiSA/PCFM, the inset of (d) displays the lattice fringe. e EDS mapping of an independent NiSA/PCFM nanofiber. f Magnified HAADF-STEM images of NiSA/PCFM, those white dots are supposed to be Ni single atoms. Scale bars, 100 μm (b), 1 μm (c), 0.5 μm (d), and 2 nm (f).