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Methanol oxidation catalysis and substructure of PtRu bimetallic nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
43529 45975 2007 8 PDF Available
Title
Methanol oxidation catalysis and substructure of PtRu bimetallic nanoparticles
Abstract

Catalytic material of PtRu nanoparticles supported on carbon (PtRu/C) for direct methanol fuel cells was synthesized by a polyol reduction method. Addition of phosphorus was effective for downsizing PtRu particles and improving their catalytic activity. The activity obtained was six times of that of a commercial catalysis. The samples were analyzed by techniques of X-ray absorption fine structure (XAFS) at Pt LIII-edge and Ru K-edge, transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF). These results indicated a core–shell structure consisting of a Pt-rich core and Ru-rich shell. By examining coordination numbers determined by XAFS analysis, we found a clear correlation between the catalytic activity and the Pt–Ru atomic pair frequency occurring on the particle surface, which supports the “bi-functional mechanism”.

Graphical abstractPtRu nanoparticles catalyst supported on carbon was synthesized and analyzed. The results indicated a clear correlation between the catalytic activity and Pt–Ru atomic pair frequency occurring on the particle surface, which support the “bi-functional mechanism”. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
PtRu bimetallic catalyst; DMFC; Bi-functional mechanism; EXAFS; Core–shell structure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 326, Issue 2, 15 July 2007, Pages 194–201
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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