Photocatalytic and photoelectrochemical hydrogen production on strontium titanate single crystals
Sustained photogeneration of hydrogen was observed on metal-free as well as on platinized SrTiO/sub 3/ single crystals illuminated in aqueous alkaline electrolytes or in the presence of electrolyte films. Hydrogen evolution rates increased with electrolyte hydroxide concentration, most strongly at hydroxide concentrations above 5 N. Both stoichiometric and prereduced metal-free crystals were active for hydrogen photoproduction. No activity was observed from crystals in neutral or acidic solutions or in water vapor in the absence of a crust of a basic deliquescent compounds. 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.
- Research Organization:
- Univ. of California, Berkeley, CA (United States)
- OSTI ID:
- 7017699
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 102
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
HYDROGEN PRODUCTION
PHOTOELECTROLYSIS
PHOTOLYSIS
STRONTIUM TITANATES
AQUEOUS SOLUTIONS
CATALYSTS
ELECTROLYTES
MONOCRYSTALS
PHOTOCHEMICAL REACTIONS
SODIUM HYDROXIDES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHEMICAL REACTIONS
CRYSTALS
DECOMPOSITION
DISPERSIONS
ELECTROLYSIS
HYDROGEN COMPOUNDS
HYDROXIDES
LYSIS
MIXTURES
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
STRONTIUM COMPOUNDS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
080101 - Hydrogen- Production- Electrolysis