Pt-Cu/C and Pd Modified Pt-Cu/C electrocatalysts for the oxygen reduction reaction in direct methanol fuel cells
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Data
2010
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Resumo
In this work, different carbon supported Pt-Cu catalysts and Pd modified Pt-Cu catalysts were
prepared by chemical reduction of Pt, Cu and Pd precursors with sodium borohydride, and their
electrocatalytic activity for the oxygen reduction reaction was studied. X-ray diffraction analysis
indicated alloy formation. Transmission electron microscopy (TEM) showed that the metal
nanoparticles are well-distributed on the carbon support. Dispersive X-ray absorption spectroscopy
(DXAS) was used to achieve a better understanding of the intrinsic properties of the materials. The
electrocatalysts were characterized electrochemically by cyclic voltammetry in 0.5 mol L-1 H2SO4
and their electrochemical activity was studied with steady-state experiments in a direct methanol
fuel cell (DMFC). The introduction of Pd led to an improvement of the catalytic activity of the
Pt-Cu catalysts. The best performance in a DMFC was obtained using, as cathode, a Pt50Pd40Cu10/C
alloy catalyst thermally treated at 500 oC in an H2/Ar atmosphere.
Descrição
Palavras-chave
Oxygen reduction reaction, Electrocatalysis, DMFC, Cathodes
Citação
CARBONIO, Emilia A. et al. Pt-Cu/C and Pd Modified Pt-Cu/C electrocatalysts for the oxygen reduction reaction in direct methanol fuel cells. Journal of the Brazilian Chemical Society, Campinas, v. 21, n. 4, p. 590-602, 2010.