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The effect of Pt characteristics on the photoactivity of Pt/TiO2 for hydrogen production from ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
54949 47033 2013 6 PDF Available
Title
The effect of Pt characteristics on the photoactivity of Pt/TiO2 for hydrogen production from ethanol
Abstract

Pt/TiO2 photo-catalysts prepared by different methodologies (deposition–precipitation and wet impregnation using various Pt precursors) are investigated for the photo-production of hydrogen from aqueous solutions of ethanol. Textural, structural and surface catalyst properties are determined by N2 adsorption isotherms, UV–vis spectroscopy, XRD and XPS and related to the photo-activity results. Physicochemical characterization of Pt/TiO2 samples revealed differences in the electronic state and surface concentration of Pt nanoparticles depending on the method of preparation. Stronger interaction of Pt nanoparticles with TiO2 support that leads to some partially charged Pt particles was observed in the samples prepared by the deposition–precipitation (Ptδ−) and by impregnation (Ptδ+) using neutral Pt acetylacetonate precursor. It is found that H2 production rates on Pt/TiO2 photo-catalysts depend on the characteristics of Pt particles showing the partially charged Pt particles (Ptδ−and Ptδ+) better intrinsic photoactivity than that observed for metallic Pt counterpart. The improvement in the intrinsic activity observed for the partially charged Pt particles is attributed to a better e-conductivity (in the case of Ptδ− particles) and an increase in the adsorption of surface molecules (in the case of Ptδ+) extending the e-/hole carrier separation of TiO2 photo-catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (98 K)Download as PowerPoint slideHighlights► Pt/TiO2 prepared by different methods are studied as photo-catalysts. ► The characteristics of Pt nanoparticles depend on the method of preparation ► H2 photo-production rates depend on the characteristics of Pt nanoparticles ► Better photo-activity is observed for partially charged Pt particles.

Keywords
TiO2; Platinum; Photo-catalyst; Hydrogen; Ethanol
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The effect of Pt characteristics on the photoactivity of Pt/TiO2 for hydrogen production from ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 210, 1 July 2013, Pages 33–38
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
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