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

Journal Article · Thu Oct 21 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100144a027· OSTI ID:5662607

Bedja, I; Hotchandani, S ^[1]; Kamat, P V ^[2]

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1. Univ. of Notre Dame, IN (United States) Universite du Quebec a Trois Rivieres, Quebec (Canada)
2. Univ. of Notre Dame, IN (United States)

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.

• OSTI ID: 5662607
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:42; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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CHALCOGENIDES
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DISPERSIONS
DYES
ELECTRO-OPTICAL EFFECTS
ELECTROCHEMICAL CELLS
ELECTROCHROMISM
ENERGY STORAGE
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PHOTOCHEMICAL REACTIONS
PHOTOELECTROCHEMICAL CELLS
PHOTOLYSIS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEMICONDUCTOR MATERIALS
SOLAR EQUIPMENT
STORAGE
TRANSITION ELEMENT COMPOUNDS
TRAPPING
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TUNGSTEN OXIDES