Electron transfer in aqueous colloidal SnO sub 2 solutions
Journal Article
·
· Langmuir; (United States)
- Univ. of Melbourne, Parkville, Victoria (Australia)
- Argonne National Lab., IL (USA)
Electron-transfer reactions on transparent colloidal SnO{sub 2} have been examined by use of radiolytically generated reducing radicals, direct band-gap excitation, and photosensitization using Ru(bpy){sub 3}{sup 2+}. Colloidal SnO{sub 2} was found to be cathodically stable under the reducing conditions examined. Quantitative amounts of H{sub 2} formed in solution following electron transfer from radiolytically generated isopropyl alcohol radicals. No hydrogen, however, was produced if the sol was illuminated at 300 nm, even in the presence of a hole scavenger. Yet, if the electron acceptor methylviologen was present, the characteristic blue color of the viologen radical formed readily with time of illumination. Charge transfer from excited, adsorbed Ru(bpy){sub 3}{sup 2+} was found to be strongly dependent on pH and electrolyte concentration. This has been scribed to the effect that pH and added electrolyte both control the electrostatic potential on the colloidal SnO{sub 2}, which in turn influences the adsorption of the ruthenium complex and therefore the extent of quenching.
- OSTI ID:
- 5489356
- Journal Information:
- Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 6:3; ISSN LANGD; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
COLLOIDS
COMPLEXES
DECOMPOSITION
DISPERSIONS
ELECTRON TRANSFER
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
RADIATION EFFECTS
RADIOLYSIS
RUTHENIUM COMPLEXES
SOLUTIONS
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENT COMPLEXES
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
COLLOIDS
COMPLEXES
DECOMPOSITION
DISPERSIONS
ELECTRON TRANSFER
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
RADIATION EFFECTS
RADIOLYSIS
RUTHENIUM COMPLEXES
SOLUTIONS
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENT COMPLEXES