INVESTIGADORES
MARTINS Maria Elisa
artículos
Título:
New insights about the electro-oxidation of glycerol on platinum nanoparticles supported on multi-walled carbon nanotubes
Autor/es:
FERNÁNDEZ P. S.; MARTINS M. E.; CÂMARA G. A.
Revista:
ELECTROCHIMICA ACTA
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 66 p. 180 - 187
ISSN:
0013-4686
Resumen:
Here we investigate the glycerol electro-oxidation reaction on carbon platinum nanoparticles supported
on multi-walled carbon nanotubes (MWCNTs) obtained by reduction with ethylene glycol. The particles
obtained show uniform particle diameters with a little size dispersion (2.8 ± 0.2 nm). Cyclic voltammetry
shows the existence of multiple oxidation peaks, which are related with different electrooxidation
steps. We follow the voltammetric response of Pt/MWCNT in the presence of glycerol by using in situ
FTIRS. Results suggest that CO2 is produced by two independent pathways. The first one happens at low
potentials and depends on the previous formation of adsorbed CO, while the second one occurs at high
potentials and seems to depend on the reaction of glycerol in solution with adsorbed Pt?O. FTIRS results
also show products of higher degree of oxidation as the potential increases. Results were interpreted in
terms of a growing superficial recovering by Pt?O species with the potential.