Photoactivity and photoselectivity of a dielectric metal-oxide photocatalyst (ZrO_2) probed by the photoinduced reduction of oxygen and oxidation of hydrogen

摘要

The photoinduced reduction of oxygen and photooxidation of hydrogen occurring on oxidized and reduced surfaces of the metal-oxide dielectric material ZrO_2 (in monoclinic form) have been examined to probe the spectral variations of the photoactivity and photoselectivity of this metal oxide by determining (true) photochemically defined quantum yields for the two redox reactions at various wavelengths of photoexcitation (200nm