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. 2015 Feb 27;1(1):e1400035. doi: 10.1126/sciadv.1400035

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Copyright © 2015, The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 4 — (A and B) N 1s XPS spectra (A) and the relative content of pyridinic and graphitic N (B) in the four samples prepared with different precursors. (C and D) Mössbauer spectra for IG-C and IAG-C. (E) Relative content of D1, D2, and D3 sites in all the Fe species for both Fe-containing catalysts. (F) Possible structure model of IAG-C.