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Probing metal substrate interaction of Pt nanoparticles: Structural XRD analysis and oxygen reduction reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
42355 45921 2010 7 PDF Available
Title
Probing metal substrate interaction of Pt nanoparticles: Structural XRD analysis and oxygen reduction reaction
Abstract

Platinum nanoparticles were selectively deposited on titania via a facile photochemical method. The anatase-type TiO2 nanostructure, prepared by sol-gel, is in intimate contact with the carbon (Vulcan XC-72) used as supporting material. The structural studies via XRD in the as prepared and heat-treated samples were evaluated and compared to the substrate without oxide. The lattice constant of platinum was found 0.6% less than the value in the bulk. This observation is accompanied by high internal strains, which are not present on the Pt/C system. A healing of such defects is achieved by the thermal treatment. The consequence of such observations is discussed in terms of a strong-metal nanoparticle oxide interaction, which is favorable for electrocatalysis. These studies suggest that Pt–TiO2–C might serve as an element of response to lower the amount of utilized platinum in low temperature H2/O2 fuel cells cathodes.

Graphical abstractPlatinum nanoparticles were selectively deposited on titania via a photochemical method. The structural studies via XRD in the as prepared and heat-treated samples were evaluated and compared to the substrate without oxide. A metal nanoparticle–oxide interaction, which is favorable for electrocatalysis, is observed.Figure optionsDownload full-size imageDownload high-quality image (52 K)Download as PowerPoint slide

Keywords
X-ray structure; Metal–support interaction; Oxide; Oxygen reduction; Composites; Carbon
First Page Preview
Probing metal substrate interaction of Pt nanoparticles: Structural XRD analysis and oxygen reduction reaction
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 377, Issues 1–2, 1 April 2010, Pages 167–173
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis