Abstract
Composite polyaniline electrodes containing carbon nanotubes incorporated in the film and spontaneous Pt–Ru deposits as catalytic material for CO oxidation are reported. PANI films were electrosynthesized from a monomer acid solution with the addition of carbon nanotubes. Then, Pt–Ru deposits were obtained by immersing the polymeric film in H 2PtCl 6 and/or RuCl 3 in HCl. Three series of deposits were prepared by either immersion in a solution containing both metallic ions during a fixed time or successive immersion in different solutions containing only one of the metallic ions during half of the established time and varying the sequence as follows: (i) first in H 2PtCl 6 and then in RuCl 3 or (ii) first in RuCl 3 and then in H 2PtCl 6. Adsorbed CO oxidation was studied by cyclic voltammetry in H 2SO 4 solution. The electrodes were characterized through SEM and EDX. The different ways to obtain spontaneous Pt–Ru deposits are analyzed and their influence on CO oxidation is discussed.
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