Journal
APPLIED CATALYSIS A-GENERAL
Volume 396, Issue 1-2, Pages 68-75Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2011.01.037
Keywords
Methanol oxidation; Bimetallic catalyst; Radiolytic process; Platinum; Ruthenium
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Funding
- [19651042]
- Grants-in-Aid for Scientific Research [22241023] Funding Source: KAKEN
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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. (C) 2011 Elsevier B.V. All rights reserved.
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