Abstract
The photoelectrochemical anodic decomposition of alcohols was studied on a porous nanoparticulate TiO2 film which was illuminated with a 365 nm UV radiation. The open circuit potential (OCP) developed and the produced photocurrent (Iph) was dependent on the nature of the alcohol molecule and on the TiO2 film thickness. With increasing film thickness the OCP becomes more negative acquiring values varying between -120 mV to -210mV. Correspondingly the photocurrent was enhanced at thicker TiO2 films and more negative OCP values. This behavior can be attributed to the possibility that characterizes a nanoparticulate porous TiO2 film, to be penetrated by the electrolyte and depleted from the majority charge carriers (electrons in the conduction band). The optimum film thickness for the given UV radiation depends on the applied positive reversed bias potential and lies, between 3-7μm.
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