Enhanced Hydrogen Evolution Reaction in Alkaline Media via Ruthenium–Chromium Atomic Pairs Modified Ruthenium Nanoparticles

Abstract Precisely optimizing the electronic metal support interaction (EMSI) of the electrocatalysts and tuning the electronic structures of active sites are crucial for accelerating water adsorption and dissociation kinetics in alkaline hydrogen evolution reaction (HER). Herein, an effective strategy is applied to modify the electronic structure of Ru nanoparticles (Ru NPs ) by incorporating Ru single atoms (Ru SAs ) and Ru and Cr atomic pairs (RuCr APs ) onto a nitrogen‐doped carbon (N–C) support through optimized EMSI. The resulting catalyst, Ru NPs ‐RuCr APs ‐N‐C, shows exceptional performance for alkaline HER, achieving a six times higher turnover frequency (TOF) of 13.15 s⁻¹ at an overpotential of 100…