Abstract
The photoelectrochemical properties of nanocrystalline In 2O 3 film electrodes prepared by sol-gel method have been studied. The surface and bulk characterization of sol-gel-derived In 2O 3 films and powders heated at different temperatures has been performed using X-ray diffraction analysis, X-ray photoelectron, IR-absorption and photoelectrochemical spectroscopies. A significant shift of the photocurrent onset potential in the positive direction and a rise in the photocurrent quantum yield are observed as the temperature of the electrode heat treatment increases from 200 to 400°C. A tentative explanation for this effect has been provided, taking into account the formation of the finest hydroxide layer at the nanocrystallite surface of slightly heated In 2O 3 films.
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