Fe-N-C structures have been considered as a candidate to replace noble metal catalysts towards oxygen reduction reaction(ORR)due to their excellent electrocatalytic activity and durability.Herein,a zinc-mediated synthesis strategy is proposed for N-doped graphitic porous carbon encapsulated uniform dis-persed Fe3C nanoparticles coupled with atomically dispersed Fe-Nx moieties(NPC/Fe-N-C)derived from biomass coconut shell.The introduction of zinc species could be conductive to the dispersion of iron species and formation of porous structures.Density functional theory calculations demonstrate that the N-doped carbon coating structures can weaken the oxygen intermediates adsorption energy barrier of Fe3C.Beside,the graphitic carbon could promote the electron transfer during the electrochemical reac-tion.These special structures enable NPC/Fe-N-C to have excellent ORR activity with an Eonset of 1.0 V,which is much better than Pt/C.Furthermore,the zinc-air battery assembled by pairing NPC/Fe-N-C with a high-efficiency oxygen evolution reaction(OER)catalyst can continuously and stably operate a charge-discharge potential gap of 0.8 V at 10 mA/cm2 for more than 600 h.More importantly,the assembled batteries could drive overall water splitting device,realizing the effective energy conversion.

Guangying Zhang;Xu Liu;Peng Yu;Di Shen;Bowen Liu;Qiwen Pan;Lei Wang;Honggang Fu

Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education of the People's Republic of China,Heilongjiang University,Harbin 150080,China;Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,School of Physics and Electronic Engineering, Harbin Normal University,Harbin 150025,China

中国化学快报（英文版）

[1]Guangying Zhang;Xu Liu;Peng Yu;Di Shen;Bowen Liu;Qiwen Pan;Lei Wang;Honggang Fu-.Fe3C coupled with Fe-Nx supported on N-doped carbon as oxygen reduction catalyst for assembling Zn-air battery to drive water splitting)[J].中国化学快报（英文版）,2022(08):3903-3908

coconut

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