Abstract
Photoelectrochemical evolution of oxygen on n-TiO 2 is catalysed in basic medium by metal islets deposited on the electrode surface. The electrocatalytic effect increases linearly with D(M—H). However, no catalytic effect of the metal islets is observed in acidic solutions. Such findings are contrary to those expected on a Schottky barrier model. They are consistent with a model in which the overall rate of the photoelectrochemical reaction is controlled by the step at the metal—solution interface.
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