Confining Flat Ru Islands into TiO₂ Lattice with the Coexisting Ru-O-Ti and Ru-Ti Bonds for Ultra-Stable Hydrogen Evolution at Amperometric Current Density and Hydrogen Oxidation at High Potential.

ABSTRACT: Effective hydrogen evolution reaction (HER) under high current density and enhanced hydrogen oxidation reaction (HOR) over a wide potential range remain challenges for Ru-based electrocatalysts because its strong affinity to the adsorbed hydroxyl (OH_ad) inhibits the supply of the adsorbed hydrogen (H_ad). Herein, the coexisting Ru─O─Ti and Ru─Ti bonds are constructed by taking TiO₂ crystal confined flat-Ru clusters (F-Ru@TiO₂) to cope with above-mentioned obstacles. The different electronegativity (χ_Ti = 1.54 < χ_Ru = 2.20< χ_O = 3.44) can endow Ti in Ru─O─Ti bonds with more positive charge and stabilize Ru of Ru-Ti bonds with the low-valence. The strength of Ru─OH_ad is then weakened by the oxophilicity of

SUBMITTER: Chen L 

PROVIDER: S-EPMC11672276 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature