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artículo con referato
"Electrochemical characterization of PtRu nanoparticles supported on mesoporous carbon for methanol electrooxidation"
F.A. Viva, M.M. Bruno, M. Jobbágy and H.R. Corti
J. Phys. Chem. C 116(6) (2012) 4097-4104
Nanoparticles of PtRu supported on mesoporous carbon were obtained by the impregnation and reduction method with NaBH4. The high-surface-area mesoporous carbon was obtained by carbonization of a resorcinol-formaldehyde polymer with a cationic polyelectrolyte as a soft template. Surface characterization performed by transmission electron microscopy and powder X-ray diffraction showed a homogeneous distribution and high dispersion of metal particles. The PtRu catalyst shows an electrochemical active surface area, determined by CO stripping, 45% higher than PtRu catalyst synthesized by the same method on Vulcan. This translated in a 25% increase in the methanol oxidation current as well as a lower poisoning rate and higher turnover frequency, as was assessed by cyclic voltammetry and chronoamperometry. Differential electrochemical mass spectroscopy indicated an 8% higher conversion efficiency of methanol to CO2, demonstrating the benefits of using a mesoporous carbon as catalyst support.
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