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Electrocatalysis of Anodic Oxygen‐Transfer Reactions: Evolution of Ozone
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1994
Year
Materials ScienceOxygen Reduction ReactionCurrent EfficienciesEngineeringBattery Electrode MaterialsCorrosionSurface ElectrochemistrySurface ScienceElectrosynthesisFilm ElectrodeCatalysisUndoped ElectrodeChemistryAnodic Oxygen‐transfer ReactionsElectrochemical ProcessElectrode Reaction MechanismElectrochemistry
Current efficiencies are compared for the generation of simultaneously with during anodic discharge of at pure and iron(III)‐doped β‐lead dioxide film electrodes in phosphate buffer (pH 7.5, 10°C) containing 2.5 mM KF. Also examined is the effect of applied current density. A current efficiency of 14.6% was obtained for the Fe(III)‐doped film electrode deposited on an internally cooled (10°C) tubular titanium substrate at a current density of 200 mA cm−2 as compared to only 6.1% at the undoped electrode under the same conditions. This result is tentatively explained on the basis of a mechanism involving the transfer of oxygen from hydroxyl radicals adsorbed on Pb(IV) sites adjacent to Fe(III) sites to adsorbed at the Fe(III) sites in the surface of the Fe(III)‐doped electrodes.