Dynamic Evolution of Isolated Ru-FeP Atomic Interface Sites for Promoting Electrochemical Hydrogen Evolution Reaction
Identification of active sites in electrochemical hydrogen evolution reaction (HER) under realistic condition is critical to water electrolysis towards sustainable energy applications. Herein, we rationally designed an isolated single atom Ru-modified FeP as model catalyst with enhanced HER performance, which displayed an overpotential of 62 mV at the current density of 10 mA cm-2 and small Tafel slope of 45 mV dec-1. Importantly, through operando X-ray absorption spectroscopy measurements together with density functional theory calculations, the synergistic effect between the monodispersed metal atoms and phosphide substrate was discovered. We found that the bond-length-extended isolated Ru(+3)-P4-Fe species under catalytic conditions serve as the boosted active sites during HER, which lead to the charge redistribution at the atomic interface of the catalyst, meanwhile improve the H adsorption and H2 desorption behavior, and further promoting the HER kinetics. This work gives new viewpoints for the exploration of highly active transition-metal phosphide based HER catalysts by the refinement of atomic and electronic structure.
- This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers