biostudies-literatureUnknown147(30)Li YGreen 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 calculations revealed that the ultrahigh OER activity of Pb₂CoRuO₇ was contributed by both metal-site adsorbate evolution (MAE) at the Co site and the lattice-oxygen-vacancy-site (LOV) mechanism involving lattice oxygen located between Ru⁶⁺ and Co. Our work presents a new and unusual OER catalyst where both the MAE and LOV mechanisms cooperatively facilitate catalytic activity.Journal of the American Chemical Society26854-26864https://www.ebi.ac.uk/biostudies/studies/S-EPMC12314902biostudies-literatureHexavalent Ru Catalyst with Both Lattice Oxygen and Metal Ion Mechanisms Coactive for Water Oxidation.PMC12314902Fan YHu ZZhang LZhang SHuang YCKuo CYChan TSLi YKu YCJin CChen CTHaw SCYe DJing CZhao JKao CWZhao HfalseHexavalent Ru Catalyst with Both Lattice Oxygen and Metal Ion Mechanisms Coactive for Water Oxidation.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 calculations revealed that the ultrahigh OER activity of Pb₂CoRuO₇ was contributed by both metal-site adsorbate evolution (MAE) at the Co site and the lattice-oxygen-vacancy-site (LOV) mechanism involving lattice oxygen located between Ru⁶⁺ and Co. Our work presents a new and unusual OER catalyst where both the MAE and LOV mechanisms cooperatively facilitate catalytic activity.2025-01-01T00:00:00Z2025 Jul2026-03-15T11:38:04.205Z2025-08-12T03:04:54.855ZS-EPMC123149024067116910.1021/jacs.5c08425