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Sustained photogeneration of hydrogen was observed on metal~free as well as on platinized SrTi0 3 single crystals illuminated in aqueous alkaline electrolytes or in the presenee of electrolyte films.Hydrogen evolution rates increased with eleetrolyte hydroxide concentration) most strongly at hydroxide concentrations above 5N, Both stoichiometricand pre-reduced metal-free crystals were active for hydrogen photoproduction.No activity was observed from crystals in neutral or aeidic solutions or in water vapor in the absenee of a crust of a basic deliquescent compound.Metal-free crystals appear to evolve hydrogen via a photocatalytic mechanism in which all chemistry occurs at the illuminated surface.The results allow direct comparison of the photocatalytic and photoelectrochemical processes and have implications for the development of heterogeneous photocatalysis at the gas-solid interface.iii
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Wagner et al. (1980) studied this question.
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