The role of trace Fe in Fe-N-doped amorphous carbon with excellent electrocatalytic performance for oxygen reduction reaction

Synthesized by dripping iron acetate into the N-doped carbon film enriched with pyridinic N and followed by annealing at 800 degrees C, Fe-N-doped amorphous carbon (d(Fe-N)-C) with an Fe content of 02 at% showed excellent electrocatalytic activity, stability and methanol tolerance via a four-electron pathway for oxygen reduction reaction (ORR), which outperformed commercial Pt/C catalyst. More importantly, by tuning the Fe content and annealing temperature, the trace Fe in dF,N-C was supposed to form high active FeN4 sites with pyridinic N and played an important role in the excellent electrocatalytic performance for ORR. (C) 2014 Elsevier B.V. All rights reserved.