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artículo con referato
"Mesoporous carbon supported PtRu as anode catalyst for direct methanol fuel cell: Polarization measurements and electrochemical impedance analysis of mass transport"
Mariano M. Bruno, M. Agustina Petruccelli, Federico A. Viva and Horacio R. Corti
Int. J. Hydrogen Energ. 38(10) (2013) 4116-4123
The performance of membrane electrode assembly (MEA) prepared with PtRu nanoparticles supported on a mesoporous carbon as anode catalyst are presented and compared against PtRu synthesized over Vulcan carbon. Polarization and power curves were obtained using 1 M methanol aqueous solution at the anode and O2 at the cathode. The mesoporous carbon supported catalyst shows peak power of 40 mW cm-2 and 67 mW cm-2 at 30 °C and 60 °C respectively, that is, 15.30% higher than the Vulcan supported catalyst, and exhibits a wider range of operating current. Moreover, an improvement in the mass transport is observed for the catalyst supported on mesoporous carbon, yielding a lower voltage drop at high current density. This behavior was confirmed by electrochemical impedance spectroscopy (EIS), where an increases of the Warburg coefficient value by a factor 3.4 for the catalyst supported on mesoporous carbon as compared with that supported on Vulcan, would indicate a more facile diffusion of methanol through the mesoporous carbon.
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