Photoelectrochemistry of quantized WO[sub 3] colloids. Electron storage, electrochromic, and photoelectrochromic effects

Electron storage effects in quantized WO[sub 3] colloids have been investigated by spectroelectrochemical and photochemical methods. Electrons trapped within the colloidal particles exhibit blue coloration with absorption in the red-IR region. From picosecond laser flash photolysis experiments, we e...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1993-10, Vol.97:42
Main Authors: Bedja, I., Hotchandani, S., Kamat, P.V.
Format: Article
Language:English
Subjects:
360606 > Other Materials-- Physical Properties-- (1992-)
400500 > Photochemistry
CHALCOGENIDES
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DISPERSIONS
DYES
ELECTRO-OPTICAL EFFECTS
ELECTROCHEMICAL CELLS
ELECTROCHROMISM
ENERGY STORAGE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
KINETICS
MATERIALS
MATERIALS SCIENCE
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL ENERGY STORAGE
PHOTOCHEMICAL REACTIONS
PHOTOELECTROCHEMICAL CELLS
PHOTOLYSIS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEMICONDUCTOR MATERIALS
SOLAR ENERGY
SOLAR EQUIPMENT
STORAGE
TRANSITION ELEMENT COMPOUNDS
TRAPPING
TUNGSTEN COMPOUNDS 140505 > Solar Energy Conversion-- Photochemical, Photobiological, & Thermochemical Conversion-- (1980-)
TUNGSTEN OXIDES
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Description
Summary:Electron storage effects in quantized WO[sub 3] colloids have been investigated by spectroelectrochemical and photochemical methods. Electrons trapped within the colloidal particles exhibit blue coloration with absorption in the red-IR region. From picosecond laser flash photolysis experiments, we estimate the rate constant for electron trapping to be 10[sup 10] s[sup [minus]1]. These trapped electrons are stable in an inert atmosphere and can be utilized to reduce substrates such as thiazine and oxazine dyes which have reduction potentials less negative than the conduction band of WO[sub 3]. The rate constants for the heterogeneous electron transfer at the semiconductor/electrolyte interface are in the range (0.7-2.4) [times] 10[sup 9] M[sup [minus]1] s[sup [minus]1]. 43 refs., 10 figs., 1 tab.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100144a027