Colloidal semiconductors in systems for the sacrificial photolysis of water: sensitization of TiO/sub 2/ by adsorption of ruthenium complexes
Adsorbed tris(2,2'-bipyridine-4,4'-dicarboxylic acid)ruthenium(II) molecules (Ru/sup II/(acid)/sub 3/) sensitize the production of H/sub 2/ that occurs when Pt/TiO/sub 2/ dispersions are illuminated with visible light in the presence of EDTA as sacrificial electron donor. Ru/sup II/(acid)/sub 3/ adsorbs on TiO/sub 2/ at pH values below the isoelectric point of the TiO/sub 2/ (6.1) in response to electrostatic attraction between its dissociated species and positively charged TiO/sub 2/ particles. In contrast to band-gap systems, sensitized systems are not regenerated by readjustment of pH and addition of electron donor. Clearly, sensitization requires adsorption of sensitizer in the first adsorbed layer in addition to favorable redox potentials for electron injection from sensitizer into the conduction band of the TiO/sub 2/ particles. Multilayers of sensitizer do not assist electron injection but instead reduce the amount of light available to the first adsorbed layer. 50 references, 8 figures, 4 tables.
- Research Organization:
- CSIRO, Melbourne, Australia
- OSTI ID:
- 5828253
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:6; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
AMINO ACIDS
AZINES
BINDING ENERGY
BIPYRIDINES
CARBOXYLIC ACIDS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COLLOIDS
COMPLEXES
DATA
DECOMPOSITION
DISPERSIONS
EDTA
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FERMIONS
HETEROCYCLIC COMPOUNDS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
LEPTONS
METALS
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PLATINUM
PLATINUM METALS
PYRIDINES
RUTHENIUM COMPLEXES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE
WATER