Abstract
Compressed discs of naked TiO 2 or TiO 2 coated with a thin film of a noble metal (e.g. Pt) do not photodissociate water upon illumination with UV light but small amounts of H 2 are generated if the TiO 2 has been reduced in a stream of H 2 at 600°C. Discs prepared from mixtures of TiO 2/RuO 2 facilitate the UV photodissociation of water into H 2 and O 2 although the yields are very low. When a thin (ca. 9nm) film of Pt is applied to the TiO 2/RuO 2 discs the yields of H 2 and O 2 observed upon irradiation with UV light are improved drastically.
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