Fig. 5From: Nanochannel-Controlled Synthesis of Ultrahigh Nitrogen-Doping Efficiency on Mesoporous Fe/N/C Catalysts for Oxygen Reduction ReactionN 1s XPS spectra of m-Fe/N/C-800 (a), m-Fe/N/C-900 (b), m-Fe/N/C-950 (c), and their relative contents in total N content (d)Back to article page