A family of cheap carbon black based Fe-N-x/C electrocatalysts with superhigh-performance for oxygen reduction reaction (ORR) were synthesized. The one with Fe 10 wt% and N 1.57 wt% shows the best performance. The activity order of different active sites for ORR was revealed firstly: Fe-N-4/2-C > Fe-4-N-C > N-C >> Fe-4-C approximate to C
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