Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 13, Pages 4022-4029Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.01.001
Keywords
Pt-Ru electrocatalysts; Ordered mesoporous carbon; Methanol oxidation; Direct methanol fuel cell
Funding
- FEDER, Spanish MEC [MAT2008-06631-C03-01, MAT2008-06631-C03-02, MAT2008-06631-C03-03, BES-2005-0169]
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Pt-Ru electrocatalysts supported on ordered mesoporous carbon (CMK-3) were prepared by the formic acid method. Catalysts were characterized applying energy dispersive X-ray analyses (EDX) and X-ray diffraction (XRD). Methanol and carbon monoxide oxidation was studied electrochemically by cyclic voltammetry, and current-time curves were recorded in a methanol solution in order to establish the activity towards this reaction under potentiostatic conditions. The physicochemical and electrochemical properties of the Pt-Ru catalysts supported on CMK-3 carbon were compared with those of electrocatalysts supported on Vulcan XC-72 and commercial catalyst from E-TEK. Additionally, in order to complete this study, Pt electrocatalysts supported on CMK-3 and Vulcan XC-72 were prepared by the same method and were used as reference. Results showed that the Pt-Ru/CMK-3 catalyst presented the best electrocatalytic activity towards the CO oxidation and, therefore, good perspectives to its application in DMFC anodes. On the other hand, the activity of the Pt-Ru/CMK-3 catalyst towards methanol oxidation was higher than that of the commercial Pt-Ru/C (E-TEK) catalyst on all examined potentials, confirming the potential of the bimetallic catalysts supported on mesoporous carbons. (C) 2010 Elsevier B.V. All rights reserved.
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