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5.1% Apparent quantum efficiency for stable hydrogen generation over eosin-sensitized CuO/TiO2 photocatalyst under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53099 46907 2007 7 PDF Available
Title
5.1% Apparent quantum efficiency for stable hydrogen generation over eosin-sensitized CuO/TiO2 photocatalyst under visible light irradiation
Abstract

A dye-sensitized CuO incorporated TiO2 catalyst was found to be an active photocatalyst for the photocatalytic hydrogen production from water under visible light (> 420 nm) irradiation in the presence of electron donors such as triethanolamine, acetonitrile and triethylamine. The stronger adsorption of eosin Y on the CuO incorporated TiO2 catalyst by multidentate complexation than on pure TiO2 was proved by the method of spectrophotometry, namely, the addition of CuO strongly improved the adsorption capability of TiO2 toward eosin dye and this effect led to a high quantum efficiency of eosin-sensitized CuO/TiO2 for photocatalytic water splitting. The electrons excited from the sensitizer molecules which were strongly adsorbed both on TiO2 and CuO by the visible light injected into the conduction band (CB) of both TiO2 and CuO, the electrons in CB of TiO2 subsequently transferred to CB of CuO, which resulted in a build-up of excess electrons in the conduction band of CuO. Consequently, the accumulation of excess electrons in CuO causes a negative shift in the Fermi level of CuO. As a result of that, the significant enhancement of apparent quantum yield (∼5.1%) and a good stability was obtained over the dye-sensitized 1.0 wt% CuO/TiO2 photocatalyst.

Keywords
Hydrogen evolution; Visible light; Dye-sensitized TiO2
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5.1% Apparent quantum efficiency for stable hydrogen generation over eosin-sensitized CuO/TiO2 photocatalyst under visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 8, August 2007, Pages 1267–1273
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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
Online Support
Any Questions? feel free to contact us