Electrochemical and fuel cell evaluation of PtIr/C electrocatalysts for ethanol electrooxidation in alkaline medium
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Electrocatalysis
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PtIr/C electrocatalysts prepared by borohydride reduction process were characterized by X-ray diffraction, transmission electron microscopy, and cyclic voltammetry. The X-ray
diffraction measurements suggested the PtIr alloy formation;
furthermore, peaks of IrO2 were not observed; nevertheless, the
presence of Ir oxides in small amounts and amorphous forms
cannot be discarded. The transmission electron microscopy
showed the average particle diameter between 4.0 and 6.0 nm
for all compositions prepared. The catalytic activity for ethanol
electrooxidation in alkaline medium at room temperature (cyclic
voltammetry and chronoamperometry results) showed that
PtIr/C (70:30) and PtIr (90:10) exhibited higher performance
toward ethanol oxidation than the other electrocatalysts. Experiments using direct ethanol alkaline fuel cell at 75 °C showed PtIr
(90:10) as the best electrocatalyst and Ir/C as virtually inactive
for ethanol oxidation in real conditions. The best result obtained
using PtIr/C may be associated to the electronic effect between Pt
and Ir that could decrease the poisoning on catalyst surface and
also by the occurrence of bifunctional mechanism.
Como referenciar
SILVA, SIRLANE G. da; ASSUMPCAO, MONICA H.M.T.; SOUZA, RODRIGO F.B. de; BUZZO, GUILHERME S.; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SILVA, JULIO C.M. Electrochemical and fuel cell evaluation of PtIr/C electrocatalysts for ethanol electrooxidation in alkaline medium. Electrocatalysis, v. 5, n. 5, p. 438-444, 2014. DOI: 10.1007/s12678-014-0213-2. Disponível em: http://repositorio.ipen.br/handle/123456789/9024. Acesso em: 30 Dec 2025.
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