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Compressive strain as the main origin of enhanced oxygen reduction reaction activity for Pt electrocatalysts on chromium-doped titania support

Paper ID Volume ID Publish Year Pages File Format Full-Text
45861 46426 2014 7 PDF Available
Title
Compressive strain as the main origin of enhanced oxygen reduction reaction activity for Pt electrocatalysts on chromium-doped titania support
Abstract

•The origin for ORR activity in Pt on titania has been in significant debate.•We resolve this controversy by considering a lattice strain effect.•The main origin is the compressive strain rather than the charge transfer.

In this study, we have attempted to clarify the origin of the enhanced oxygen reduction reaction (ORR) activity of Pt on titania supports, which has been the subject of significant debate. To date, it has been claimed in several studies that the charge transfer from titania to Pt is the main origin of the enhanced ORR activity, while the theoretical adsorption model suggested that such charge transfer to Pt could lead to stronger OH adsorption and therefore a negative effect on ORR activity. We resolve this controversy by considering a lattice strain effect induced by the strong metal support interaction. EXAFS studies clearly show that a compressive strain leading to a lower d-band center is exerted on the Pt lattice on the titania-based supports. Hence, we strongly suggest that the main origin for the enhanced ORR activity is the compressive strain rather than the charge transfer.

Graphical abstractTo date, it has been claimed in several studies that the charge transfer from titania to Pt is the main origin of the enhanced ORR activity, while the theoretical adsorption model suggested that such charge transfer to Pt could lead to stronger OH adsorption and therefore a negative effect on ORR activity. We resolve this controversy by considering a lattice strain effect induced by the strong metal support interaction.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
ORR, oxygen reduction reaction; PEMFCs, proton exchange membrane fuel cells; SMSI, strong metal-support interaction; DFT, density functional theory; XPS, X-ray photoelectron spectroscopy; XANES, X-ray absorption near edge structure; EXAFS, extended X-ray
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Compressive strain as the main origin of enhanced oxygen reduction reaction activity for Pt electrocatalysts on chromium-doped titania support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 112–118
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