Dynamics of light-induced water cleavage in colloidal systems

Journal Article · Wed Aug 12 04:00:00 EDT 1981 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00406a004· OSTI ID:6429383

Duonghong, D; Borgarello, E; Graetzel, M

A transparent TiO/sub 2/ sol (particle radius 200 A) is produced via hydrolysis of titanium tetraisopropoxide in acid aqueous solution. When loaded simultaneously with ultrafine Pt and RuO/sub 2/ deposits, these particles display extremely high activity as water decomposition catalysts. Band-gap excitation of the TiO/sub 2/ generates H/sub 2/ with a quantum yield of 30 +- 10%. Oxygen is produced in stoichiometric proportion. When Ru(bpy)/sub 3//sup 2 +/ or rhodamine B is used as a sensitizer, water is decomposed by visible light. Addition of methyl viologen (MV/sup 2 +/) increases significantly the H/sub 2/ yield. Laser photolysis experiments performed with the Ru(bpy)/sub 3//sup 2 +//MV/sup 2 +/ system illustrate the high rate and specificity of the catalytic reactions leading to hydrogen and oxygen production from water. 9 figures.

• Research Organization: Institut de Chimie Physique, Lausanne, Switzerland
• OSTI ID: 6429383
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 103:16; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080106* -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes
AZINES
BIPYRIDINES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COLLOIDS
COMPLEXES
DECOMPOSITION
DISPERSIONS
ELECTROCHEMICAL CELLS
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUIPMENT
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
LASER RADIATION
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOELECTROCHEMICAL CELLS
PHOTOLYSIS
PLATINUM
PLATINUM METALS
PYRIDINES
RADIATIONS
RUTHENIUM COMPLEXES
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SOLAR EQUIPMENT
SOLS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VISIBLE RADIATION
WATER