Abstract
Polycrystalline TiO 2− x pellets were equilibrated at 1220–1420 K in a flow of Ar + 7 vol.% H 2 gas mixture. The resulting deviation x from stoichiometric composition of titanium dioxide was determined gravimetrically. X-ray diffractometry revealed coexistence of rutile with Ti n O 2 n−1 Magnéli phases. Optical reflectance and photocurrent spectroscopies served as experimental methods of the band gap determination. Polycrystalline TiO 2− x were used as photoanodes in a photoelectrochemical cell. The photocurrent response to the applied voltage was studied. It was found that TiO 2− x with x ca. 0.006 exhibited the best photoelectrochemical performance.
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