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Methanol oxidation catalysis and substructure of PtRu/C bimetallic nanoparticles synthesized by a radiolytic process

Paper ID Volume ID Publish Year Pages File Format Full-Text
41681 45896 2011 8 PDF Available
Title
Methanol oxidation catalysis and substructure of PtRu/C bimetallic nanoparticles synthesized by a radiolytic process
Abstract

Nanoparticle catalysts of PtRu/C for the direct methanol fuel cell anode were synthesized by a radiolytic process. Bimetallic substructures were controlled by varying irradiation dose rate and by addition of NH4OH or NaH2PO2. Material characterization was performed with the transmission electron microscopy, the X-ray diffraction, the X-ray fluorescence spectroscopy and the X-ray absorption fine structure techniques. Methanol oxidation activity was evaluated by the linear sweep voltammetry. We concluded that the structure of the radiolytically synthesized catalysts has a Pt-rich core/Ru-rich shell structure or incomplete alloy structure. A correlation between the substructures and catalytic activities was found by using a pairing factor defined from coordination numbers determined by the extend X-ray absorption fine structure analysis, which indicates the validity of the bifunctional mechanism in the PtRu nanoparticle system. This radiolytic process is promising for synthesizing advanced PtRu/C catalysts with well-mixed bimetallic substructures enhancing methanol oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (108 K)Download as PowerPoint slideResearch highlights► Highly active PtRu/C nanoparticle catalysts are synthesized by a radiolytic process, which is a simple one-pot process without any use of surfactant, solvent or heating. ► The mixed state of PtRu is controlled by using high dose rates and additives to the synthetic solution. ► A correlation between the substructure of the catalysts and the activity of methanol oxidation was found.

Keywords
Methanol oxidation; Bimetallic catalyst; Radiolytic process; Platinum; Ruthenium
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Methanol oxidation catalysis and substructure of PtRu/C bimetallic nanoparticles synthesized by a radiolytic process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 396, Issues 1–2, 15 April 2011, Pages 68–75
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
Online Support
Any Questions? feel free to contact us