Unveiling the promotion of accelerated water dissociation kinetics on the hydrogen evolution catalysis of NiMoO4 nanorods

Nickel molybdate (NiMoO4) attracts superior hydrogen desorption behavior but noticeably poor for efficiently driving the hydrogen evolution reaction (HER) in alkaline media due to the sluggish water dissociation step.Herein,we successfully accelerate the water dissociation kinetics of NiMoO4for prominent HER catalytic properties via simultaneous in situ interfacial engineering with molybdenum dioxide(MoO2) and doping with phosphorus (P).The as-synthesized P-doped NiMoO4/Mo O2heterostructure nanorods exhibit outstanding HER performance with an extraordinary low overpotential of-23 m V at a current density of 10 m A cm-2,which is highly comparable to the performance of the state-of-art Pt/C coated on nickel foam (NF) catalyst.The density functional theory (DFT) analysis reveals the enhanced performance is attributed to the formation of Mo O2during the in situ epitaxial growth that substantially reduces the energy barrier of the Volmer pathway,and the introduction of P that provides efficient hydrogen desorption of Ni Mo O4.This present work creates valuable insight into the utilization of interfacial and doping systems for hydrogen evolution catalysis and beyond.