Components of a water photoreduction system
Investigations of the solar conversion system involving a water splitting system in which trisbipyridylruthenium(II), Ru(bipy)/sub 3//sup 2 +/, is the photosensitizer oxidatively quenched by the electron transfer mediator, methyl viologen, is reported. The methyl viologen cation radical can either recombine with Ru(bipy)/sub 3//sup 3 +/ or reduce water to hydrogen in the presence of a collodial platinum catalyst. Ru(bipy)/sub 3//sup 3 +/ oxidizes water to oxygen in the presence of RuO/sub 2/. The collodial catalysts make the water splitting reaction rates competetive with the back reaction rate. The system was investigated from the aspects of (1) alternate photosensitizers, (2) function of the collodial Pt catalyst, and (3) water oxidation. Polypyridyl chromium complexes and zinc porphyrins were found to function as photosensitizers and are among the first reported alternate photosensitizers. An electrochemical model to describe the behavior of the colloidal platinum catalyst is proposed and was experimentally verified. This model can be used to predict the effects of several reaction variables on the kinetics of the system. Results of an investigation of the water oxidation reaction are consistent with microelectrode behavior of colloidal ruthenium dioxide. The observation of a ligand degradation reaction suggests that optimization of the water oxidation rate by use of stronger oxidants may be difficult.
- OSTI ID:
- 6031922
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHROMIUM COMPLEXES
CATALYTIC EFFECTS
HYDROGEN PRODUCTION
PHOTOCHEMICAL REACTIONS
PLATINUM
RUTHENIUM OXIDES
WATER
PHOTOCHEMISTRY
ZINC COMPLEXES
BIPYRIDINES
CATALYSIS
CHEMICAL PREPARATION
COLLOIDS
ELECTRON TRANSFER
HYDROGEN
REDUCTION
RUTHENIUM COMPLEXES
AZINES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DISPERSIONS
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
METALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PYRIDINES
RUTHENIUM COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry