Sustained water cleavage by visible light

Sustained water cleavage by visible light

Sustained cleavage of water by 4 quanta of visible light is achieved in aqueous solutions by using a bifunctional redox catalyst composed of Pt and RuO/sub 2/ cosupported by colloidal TiO/sub 2/ particles. A photochemical model system containing Ru(bpy)/sub 3//sup 2 +/ as a sensitizer and methyl vio...

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Veröffentlicht in:J. Am. Chem. Soc.; (United States) 1981-10, Vol.103 (21), p.6324-6329
Hauptverfasser: Borgarello, Enrico, Kiwi, J, Pelizzetti, Ezio, Visca, Mario, Graetzel, Michael
Format: Artikel
Sprache:eng
Schlagworte:
08 HYDROGEN
080106 - Hydrogen- Production- Biosynthesis & Photochemical Processes
400500 - Photochemistry
AZINES
BIPYRIDINES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
COMPLEXES
DATA
DISPERSIONS
ELECTRON TRANSFER
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PLATINUM
PLATINUM METALS
PYRIDINES
RUTHENIUM COMPLEXES
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
TEMPERATURE EFFECTS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER
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Zusammenfassung:Sustained cleavage of water by 4 quanta of visible light is achieved in aqueous solutions by using a bifunctional redox catalyst composed of Pt and RuO/sub 2/ cosupported by colloidal TiO/sub 2/ particles. A photochemical model system containing Ru(bpy)/sub 3//sup 2 +/ as a sensitizer and methyl viologen (MV/sup 2 +/) as an electron relay is used to test the effect of catalyst composition, sensitizer concentration, pH, and temperature on the efficiency of light-induced water decomposition. Electron relay free systems also exhibit high photoactivity. Direct band gap irradiation by uv light leads to efficient water cleavage in the absence of sensitizer and relay.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja00411a010