Rational design of highly efficient,robust and nonprecious electrocatalysts for the oxygen reduction reac-tion(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is highly demanded and challenging.Here,heterostructural Co3O4@Ni2P arrays with numerous reaction sites,unique interfa-cial electronic structure and fast charge transfer kinetics are developed as electrocatalysts for rechargeable Zn-air batteries and overall water splitting.Both density functional theory calculation and X-ray absorp-tion fine structure analysis manifest that the synergistic structural and abundant electronic modulations interfaces are formed,thus simultaneously promoting the electrocatalytic kinetics,activities and stabil-ities.Specifically,it can achieve an ultralow overpotential of 270 mV and 28 mV at 10 mA cm-2 for OER and HER,respectively.The water electrolyzer delivers a current density of 10 mA cm-2 at 1.563 V;furthermore,rechargeable Zn-air batteries triggered by this heterostructure can achieve excellent cyclic stability of 177 h(2 h per cycle)at 10 mA cm-2;both devices are superior to the Pt/C+Ir/C.This work not only designs an efficient trifunctional electrocatalyst but also paves an avenue to understand the het-erostructure engineering for catalysts development and disclose the underlying relationship of interfacial electronic structures and catalytic properties.

Xiaolin Hu;Tongxin Yang;Zuguang Yang;Zongyang Li;Ronghua Wang;Meng Li;Guangsheng Huang;Bin Jiang;Chaohe Xu;Fusheng Pan

College of Aerospace Engineering,Chongqing University,Chongqing 400044,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems,CQU-NUS Renewable Energy Materials & Devices Joint Laboratory,School of Energy & Power Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

材料科学技术（英文版）

[1]Xiaolin Hu;Tongxin Yang;Zuguang Yang;Zongyang Li;Ronghua Wang;Meng Li;Guangsheng Huang;Bin Jiang;Chaohe Xu;Fusheng Pan-.Engineering of Co3O4@Ni2P heterostructure as trifunctional electrocatalysts for rechargeable zinc-air battery and self-powered overall water splitting)[J].材料科学技术（英文版）,2022(20):19-28

trifunctional,nonprecious,heterostructural,C+Ir

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