Abstract
We have prepared TiO2 (anatase-phase) films by anodic-oxidation of Ti sheet followed by oxidation at 450°C in air and studied ion irradiation effect on the photocatalytic activity of water splitting by using Hg lamp and gas-chromatograph. We find that H2 evolution from water under ultraviolet (UV) light exposure increased by a factor of ∼2 after 100keV N ion irradiation of 3×1015/cm2. X-ray diffraction (XRD) shows no appreciable change in the XRD patterns before and after the ion irradiation. Rutherford backscattering spectra (RBS) of 1.8MeV He and nuclear reaction analysis (NRA) of 1.2MeV d neither show noticeable change in the composition and the amount of carbon impurities by the N ion irradiation. Possible factors for the enhancement of photocatalytic activity by ion irradiation have been discussed: increase in the surface area, optical absorption change and modification of Ti valence. Ion irradiation enhancement has been observed also for NiO-loaded TiO2 (rutile-phase).
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