Abstract
The photoelectrochemical properties of titanium–zinc mixed oxide films formed by thermal oxidation of a titanium sheet with a zinc deposited overlayer were studied in pH 8.4 borate buffer solution at 298 K. The oxides were composed of ZnO (wurtzite), TiO2 (rutile), and ZnTi2O4 depending on the oxidation temperatures. Under xenon light illumination, photocurrents were observed for the oxides and these values were higher than that of thermally formed titanium oxides. The photocurrent action spectra showed that the apparent bandgap energies of the oxides were similar to that of ZnO suggesting most of the photo-response is due to this compound. It was found that only a small amount of zinc ions were dissolved after long term photoelectrolysis indicating that the oxides are resistant to photo-induced dissolution. This may be explained by the formation of a surface titanium oxide rich layer left by partial dissolution of zinc ions.
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