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Abstract Synthesis of highly efficient nonprecious metal electrocatalysts for the oxygen reduction reaction (ORR) superior to platinum (Pt) is still a big challenge. Herein, a new highly active ORR electrocatalyst is reported based on graphene layers‐wrapped Fe/Fe 5 C 2 nanoparticles supported on N‐doped graphene nanosheets (GL‐Fe/Fe 5 C 2 /NG) through simply annealing a mixture of bulk graphitic carbon nitride (g‐C 3 N 4 ) and ferrocene. An interesting exfoliation–denitrogen mechanism underlying the conversion of bulk g‐C 3 N 4 into N‐doped graphene nanosheets is revealed. Owing to the high graphitic degree, optimum N‐doping level and sufficient active sites from the graphene layers‐wrapped Fe/Fe 5 C 2 nanoparticles, the as‐prepared GL‐Fe/Fe 5 C 2 /NG electrocatalyst obtained at 800 °C exhibits outstanding ORR activity with a 20 mV more positive half‐wave potential than the commercial Pt/C catalyst in 0.1 m KOH solution and a comparable onset potential of 0.98 V. This makes GL‐Fe/Fe 5 C 2 /NG an outstanding electrocatalyst for ORR in alkaline solution.
Hu et al. (Mon,) studied this question.