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Visible light-induced hydrogen production from glycerol aqueous solution on hybrid Pt–CdS–TiO2 photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
26575 43964 2011 6 PDF Available
Title
Visible light-induced hydrogen production from glycerol aqueous solution on hybrid Pt–CdS–TiO2 photocatalysts
Abstract

Binary (Pt/hex-CdS) and ternary (Pt/CdS/TiO2 and Pt/TiO2/hex-CdS) hybrid photocatalysts were evaluated in photoinduced reforming of glycerol under visible light irradiation (λ > 418 nm). The resulting hybrid materials are photocatalytically efficient with respect to hydrogen gas production. The relative order of reactivity for the synthesized hybrid catalysts was found to be: Pt/hex-CdS > Pt/CdS/TiO2 > Pt/TiO2/hex-CdS. The systems with CdS/aqueous solution interfacial contact showed higher activity, suggesting that the hydrogen production mechanism can be strongly influenced by hydrolytic surface reactions on CdS. The potential gradient created at the CdS/TiO2 or TiO2/hex-CdS interface may also play an important role in the photoelectrochemical mechanism. Therefore, carbonyl compounds such as acrolein and propanone, identified in the liquid phase after 7 h of irradiation, lead us to propose the first steps of a photoelectrochemical mechanism in the photoinduced reforming of glycerol.

► The materials evaluated exhibited an unprecedented activity in the photoinduced reforming of biomass under visible light irradiation. ► These materials can make effective use of solar light and produce hydrogen from glycerol aqueous solution. ► These results open up prospects for improving systems that are able to drive photoinduced reforming with visible light illumination.

Keywords
Hydrogen; Glycerol; Visible light; Photoinduced reforming; Photocatalysis
First Page Preview
Visible light-induced hydrogen production from glycerol aqueous solution on hybrid Pt–CdS–TiO2 photocatalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 226, Issue 1, 15 December 2011, Pages 36–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering