Abstract
The effects of the solvent used for preparing a coating solution on the photoelectrochemical properties of the sol-gel derived TiO 2 film electrodes have been investigated. Three series of TiO 2 film electrodes were prepared from three different coating solutions, in which ethanol, ethanol-isopropyl alcohol and ethanol-2-ethoxyethanol were used as a solvent, and Ti(OC 3H 7 i ) 4 as a source of TiO 2. The photocurrent of each series of TiO 2 film electrodes increased with increasing film thickness up to about 1 μm and became almost invariant beyond that, indicating that a film thickness of about 1 μm is required for achieving the highest efficiency. The photoelectrochemical performance of TiO 2 film electrodes was strongly dependent on the heat-treatment conditions as well as on the composition of the starting solutions. The results obtained were mainly explained in terms of the electrical resistance of the TiO 2 film electrodes.
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