The Ni3Al-based alloy has been considered as a robust catalyst for oxygen evolution reaction(OER)due to its long-term durability and acceptable activity.However,related reports about understanding the cat-alytic mechanism are rare and desirable.Herein,the effect of γ/γ'phase lattice mismatch on the cat-alytic performance caused by various cooling rates after solution heat treatment was investigated.With decreasing cooling rate,the morphologies of y'precipitates transformed from sphere to cube and the lattice mismatch increased from-0.172％to-0.409％.The increased lattice mismatch facilitated the forma-tion of the active β-NiOOH phase and enhanced the intrinsic catalytic activity,resulting in the optimized OER overpotential of 240 mV at a current density of 10 mA cm-2 with a Tafel slope of 66.1 mV dec-1 and a stability of 200 h in 1 M KOH.This work reveals the lattice mismatch effect on OER and provides a potential candidate for OER.

Shicheng Li;Hongyan Liang;Chong Li;Yongchang Liu

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

材料科学技术（英文版）

[1]Shicheng Li;Hongyan Liang;Chong Li;Yongchang Liu-.Lattice mismatch in Ni3Al-based alloy for efficient oxygen evolution)[J].材料科学技术（英文版）,2022(11):19-27

Lattice,mismatch,Ni3Al,alloy,efficient,oxygen,evolution,been,considered,robust,catalyst,reaction,OER,due,its,long,term,durability,acceptable,activity,However,related,reports,about,understanding,mechanism,rare,desirable,Herein,effect,phase,lattice,performance,caused,by,various,cooling,rates,after,solution,heat,treatment,was,investigated,With,decreasing,morphologies,precipitates,transformed,from,sphere,cube,increased,facilitated,active,NiOOH,enhanced,intrinsic,catalytic,resulting,optimized,overpotential,mV,current,density,mA,Tafel,slope,stability,KOH,This,work,reveals,provides,candidate

0.575952