Hexavalent Ru Catalyst with Both Lattice Oxygen and Metal Ion Mechanisms Coactive for Water Oxidation.

ABSTRACT: Green hydrogen from water requires the development of efficient and low-cost catalysts for anodic oxygen evolution reaction (OER), which is the main obstacle for electrochemical water splitting. Herein, we focus on an OER catalyst (Pb₂CoRuO₇) featuring Ru⁶⁺, which exhibits an ultralow overpotential of 176 mV at 10 mA cm^-2 and a Tafel slope of 30.52 mV dec^-1 vs 340 mV at 10 mA cm^-2 and a Tafel slope of 111.54 mV dec^-1 for RuO₂ in 1.0 M KOH solution. In situ X-ray absorption experiments demonstrated the gradual conversion of Ru⁵⁺ ions into high-valence Ru⁶⁺, while a portion of Co³⁺ ions transformed into Co⁴⁺ during the OER process. Density functional theory calc

SUBMITTER: Li Y 

PROVIDER: S-EPMC12314902 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature