Development of an O2‐Sensitive Fluorescence‐Quenching Assay for the Combinatorial Discovery of Electrocatalysts for Water Oxidation

Realizing their potential: The title assay has enabled rapid screening of diverse mixed-metal oxide electrocatalysts composed exclusively of earth-abundant metal ions. Several newly discovered catalyst compositions (e.g., Ni/Al/Fe oxides) exhibit substantially lower overpotentials for water oxidation than known, widely used electrocatalysts.