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Electron energy factors in photocatalytic methylviologen reduction in the presence of semiconductor nanocrystals

Paper ID Volume ID Publish Year Pages File Format Full-Text
27047 43996 2010 6 PDF Available
Title
Electron energy factors in photocatalytic methylviologen reduction in the presence of semiconductor nanocrystals
Abstract

A linear relationship between the conduction band potential of a number of semiconductor nanocrystals (CdxZn1−xS, CdSe, CdTe, ZnO) and the quantum efficiency of the photocatalytic methylviologen (MV2+) reduction was found. It reflects dependence between the rate of photoinduced electron transfer from a semiconductor nanophotocatalyst to methylviologen and the overpotential of this process and is not affected by variations in chemical composition of the photocatalytic system.Cadmium selenide nanocrystals were found to have photocatalytic properties in the MV2+ reduction by sodium sulfite. Differences in the photoprocess kinetics observed for CdSe and CdxZn1−xS nanocrystals indicate that simultaneous photocatalytic reduction of MV+ to MV0 takes place in the case of cadmium selenide. Low efficiency of this process for CdxZn1−xS nanocrystals was interpreted as a result of lowering of the energy of photogenerated electrons due to the surface trapping. The results presented show that the availability, nature, and depth of surface charge traps of a nanophotocatalyst should be taken into consideration when interpreting the kinetics of photocatalytic processes with the participation of semiconductor nanocrystals.

Keywords
Semiconductor nanocrystals; Photocatalysis; Methylviologen; Zinc oxide; Cadmium-zinc sulfide; Cadmium selenide; Photoluminescence; Charge traps
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Electron energy factors in photocatalytic methylviologen reduction in the presence of semiconductor nanocrystals
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 210, Issues 2–3, 25 February 2010, Pages 209–214
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us