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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. 2 — (A) TEM image of intermediate Fe₃O₄/carbon composite produced at 350°C. (B and C) TEM and HRTEM images of IAG-C catalyst. (D) Nitrogen adsorption-desorption curves of four samples prepared with different precursors.