Exploring low-cost,high-performance,and stable electrocatalysts toward the oxygen evolution reaction(OER)is highly desired but remains challenging.Transition metal hydroxide has been wildly utilized as a promising candidate,but practical implementation is impeded by insufficient catalytic activity,easy agglomeration,and poor conductivity.Here,we report that both phosphorization and combination with MXnene can improve the catalysts'intrinsic activity and conductivity.Besides,MXene also prevents the agglomeration of the nanoparticles,resulting in the enhanced exposure of active sites.Experimental char-acterizing and density functional theory simulations revealed that P species can attract electrons to pro-mote the formation of high-valence states of adjacent metal atoms,and coupling MXene support can effectively modulate the electronic structure and optimize the d-band center,which boosts the OER per-formance.Consequently,the optimized NiFeCoP/Mxene catalyst exhibits a low overpotential of 240 mV at a current density of 10 mA cm-2,a small Tafel slope of 55 mV dec-1,and superior long-term stability of 40 h in 1 M KOH electrolyte,which is superior to other counterparts.

School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,Ministry of Education,Tianjin University,Tianjin 300350,China;State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science and Engineering,Tianjin University,Tianjin 300354,China;College of Innovation and Entrepreneurship,Shanghai Jianqiao University,Shanghai 201306,China

[1]Ning Li;Jingrui Han;Kaili Yao;Mei Han;Zumin Wang;Yongchang Liu;Lihua Liu;Hongyan Liang-.Synergistic phosphorized NiFeCo and MXene interaction inspired the formation of high-valence metal sites for efficient oxygen evolution)[J].材料科学技术（英文版）,2022(11):90-97

phosphorized,NiFeCo,MXnene,acterizing,NiFeCoP

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