Ethanol electrooxidation on PdIr/C electrocatalysts in alkaline media: electrochemical and fuel cell studies
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PdIr/C electrocatalysts in different atomic ratios (Pd:Ir 90:10, 70:30, and 50:50), Pd/C and Ir/C
supported on Vulcan XC 72 carbon were tested for
ethanol electrooxidation in alkaline media. The
electrocatalysts were prepared by borohydride reduction
method. The electrocatalysts were characterized by Xray diffraction (XRD), transmission electron microscopy
(TEM), energy dispersive spectroscopy (EDS), cyclic
voltammetry (CV), and chronoamperometry (CA). The
XRD measurements suggested the PdIr alloy formation.
EDS analyses showed the real atomic ratios similar to
the nominal ones. TEM showed the average particle
diameter between 4.6 and 5.8 nm for all compositions
prepared. The catalytic activity for ethanol
electrooxidation in alkaline medium investigated by
CV and CA at room temperature showed that PdIr/C
(90:10) exhibited higher performance for ethanol oxidation in comparison with others PdIr/C compositions, Pd/
C and Ir/C, while the experiments on a single direct
ethanol alkaline fuel cell at 70 °C showed higher performance for PtIr (70:30). The best results obtained
using PdIr/C electrocatalysts may be associated to the
electronic effect between Pd and Ir that might cause a
decrease of poisoning on catalyst and the occurrence of
bifunctional mechanism.
Como referenciar
NETO, A.O.; SILVA, S.G. da; BUZZO, G.S.; SOUZA, R.F.B. de; ASSUMPCAO, M.H.M.T.; SPINACE, E.V.; SILVA, J.C.M. Ethanol electrooxidation on PdIr/C electrocatalysts in alkaline media: electrochemical and fuel cell studies. Ionics, v. 21, n. 2, p. 487-495, 2015. DOI: 10.1007/s11581-014-1201-5. Disponível em: http://repositorio.ipen.br/handle/123456789/23216. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.