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. 2016 Oct 31;7:13285. doi: 10.1038/ncomms13285

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a,b) Representative high resolution TEM images of the Fe–N/C catalyst, showing the absence of solid inclusions or nanoparticles and the amorphous structure. Inset (a) high resolution EDS of region corresponding to image (b) clearly showing the presence of iron. (c,d) High resolution STEM images of Fe–N/C catalyst. See Supplementary Figs 1 to 4 for more images and discussion.