Three dimensional star-like mesoporous nitrogen-doped carbon anchored with highly dispersed Fe and Ce dual-sites for efficient oxygen reduction reaction in Zn-air battery

Metal?nitrogen?carbon materials (M-N-C) have attracted much attention due to their low cost, high abundance, and efficient catalytic performance. Nevertheless, Fe-N-C are considered the most promising oxygen reduction reaction (ORR) catalysts for replacing noble metals. Ce is chemically active has many metal valence states, empty orbitals that can participate in coordination. On this basis, Fe, Ce-codoped catalyst was constructed study. The synergistic effect of dual centers verified, a nitrogen-doped carbon (FeCeNC) with six equal branch angles proposed. half-wave potential ORR catalyzed by FeCeNC 0.855 V. As rechargeable Zn-air battery cathode catalyst, exhibits excellent electrochemical performances, an open-circuit voltage 1.427 V, maximum power density 169.2 mW cm?2 stable cycling time 80 h, demonstrating cycle