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Mesoporous Pt and Pt/Ru alloy electrocatalysts for methanol oxidation |
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| Authors: | Esteban A. FranceschiniGabriel A. Planes Federico J. WilliamsGalo J.A.A. Soler-Illia Horacio R. Corti |
| Affiliation: | a Grupo de Celdas de Combustible, Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, CNEA. Av. General Paz 1499 (1650), San Martín, Buenos Aires, Argentina b Departamento de Química, Facultad de Ciencias Exactas, Fisicoquímicas y Naturales, Universidad Nacional de Río Cuarto, Agencia Postal No 3, 5800, Río Cuarto, Argentina c Departamento de Química Inorgánica, Analítica y Química-Física, INQUIMAE CONICET, Facultad Ciencias Exactas y Naturales, Pabellón 2, Ciudad Universitaria, Buenos Aires, Argentina d Gerencia de Química, Centro Atómico Constituyentes, CNEA. Av. General Paz 1499 (1650), San Martín, Buenos Aires, Argentina |
| Abstract: | Mesoporous Pt and Pt/Ru catalysts with 2D-hexagonal mesostructure were synthesized using a triblock poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) copolymer (Pluronic F127®) template, on a gold support. Large electrochemical surface areas were observed for the catalysts prepared at high overpotentials. Compared to the Pt catalyst, the Pt/Ru alloy containing 3 at% of Ru exhibited lower onset potential and more than three times the limit mass activity for methanol oxidation. This behavior is assigned to the larger pore size of the mesoporous Pt and Pt/Ru catalysts obtained with this template that seems to improve the methanol accessibility to the active sites compared to those obtained using lyotropic liquid crystals. |
| Keywords: | Methanol Fuel cells Mesoporous PtRu alloys Catalyst |
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