Improved charge separation and photosensitized H/sub 2/ evolution from water with TiO/sub 2/ particles on colloidal SiO/sub 2/ carriers

Journal Article · Wed Jun 10 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00246a012· OSTI ID:6135467

Frank, A J; Willner, I; Goren, Z; Degani, Y

Laser flash photolysis and steady-state photolysis studies show that electrostatic interactions have a dramatic influence on the kinetics for charge separation and hydrogen production in aqueous systems (pH 9.8) of 20-nm diameter TiO/sub 2/-modified SiO/sub 2/ colloids in various combinations with an electron relay, a photosensitizer, and a Pt catalyst. Either direct excitation of the semiconductor or the photosensitizer Ru(bpy)/sub 3//sup 2 +/ (bpy = 2,2'-bipyridine), electrostatically adsorbed to the colloid, initiate electron transfer to either the zwitterionic electron relay, N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium (PVS/sup 0/), or N,N'-bis(3-sulfonatopropyl)-2,2'-bipyridinium (DQS/sup 0/), or methyl viologen (MV/sup 2 +/). The rates and quantum yields for the formation of the radical PVS/sup -/ anion in both the TiO/sub 2/-SiO/sub 2//PVS/sup 0/ and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//PVS/sup 0/ systems decline with increasing ionic strength. The rate and quantum yields for H/sub 2/ production in both the TiO/sub 2/-SiO/sub 2//DQS/sup 0//Pt and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//DQS/sup 0//Pt systems also show a similar ionic strength dependence.

• Research Organization: Solar Energy Research Institute, Golden, CO
• OSTI ID: 6135467
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:12; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080106 -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes
14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AQUEOUS SOLUTIONS
AZINES
BIPYRIDINES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARGE DISTRIBUTION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
COMPLEXES
DATA
DECOMPOSITION
DISPERSIONS
EFFICIENCY
ELECTRON TRANSFER
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
INFORMATION
KINETICS
LASERS
MATERIALS
METALS
MINERALS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
PHOTOSENSITIVITY
PLATINUM
PLATINUM METALS
POTENTIALS
PYRIDINES
QUANTUM EFFICIENCY
REACTION KINETICS
RUTHENIUM COMPLEXES
SEMICONDUCTOR MATERIALS
SENSITIVITY
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOLUTIONS
STEADY-STATE CONDITIONS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER