Abstract
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.
基金项目
National Natural Science Foundation of China(52034004)
National Natural Science Foundation of China(52075373)
NETL
NSTL
万方数据