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Effect of the Thickness of Anodic Oxide Films on the Rate of the Oxygen Evolution Reaction at Pt in H[sub 2]SO[sub 4] Solution
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1974
Year
Standard Electrochemical TechniquesEngineeringOxidation ResistanceAnodic Oxide FilmsAnodic Oxide FilmChemistryChemical EngineeringElectrode Reaction MechanismVarious Current DensitiesOxygen Evolution ReactionMaterials ScienceOxide ElectronicsSurface ElectrochemistryCatalysisHydrogenElectrochemistryOxygen Reduction ReactionSurface ScienceThin FilmsElectrochemical Surface Science
Ellipsometry and standard electrochemical techniques are used to determine whether, and if so, how the thickness of an anodic oxide film affects the catalysis of the oxygen evolution reaction at platinum. A prereduced electrode is first polarized in sulfuric acid solution with a constant current density, for a given time and then the thickness, , of the anodic film and the electrode potential, , are determined for various current densities . It is found that the thickness of the oxide film affects the catalytic activity in an exponential way, i.e.