Abstract

HOYOS, BIBIAN; MONSALVE, CARLOS  and  RESTREPO, ANA. PROTON EXCHANGE MEMBRANE FUEL CELLS EVALUATION WITH Pt-M (M= Sn, Ru and Ir) ANODES FOR H₂ AND CO OXIDATION. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.156, pp.121-126. ISSN 0012-7353.

The performance of proton exchange membrane fuel cells fed with hydrogen, CO and a hydrogen - (2%) CO mixture, using oxygen in the cathode was evaluated. Six catalysts were tested for the fuels oxidation: Pt, Pt₈₅Ru₁₅, Pt₅₀Ru₅₀, Pt₉₀Ir₁₀, Pt₅₀Ir₅₀ y Pt₉₀Sn₁₀. Cathode catalyst was pure Pt. All catalyst were supported on Vulcan XC-72R ® carbon. The catalyst compositions were verified using a scanning electron microscope (SEM) and the performance tests were carried out through current - potential curves. The results showed that the preparation method produces catalyst compositions very close to those expected. Pt-Ir catalytic mixture show the lowest performance under the conditions followed in this work. Pt₉₀Sn₁₀ mixture presented a performance similar to Pt at low current values when the fuel cell was fed with pure hydrogen and it showed the best performance among the other catalysts when the cell was fed with H₂/(2%)CO. The Pt₉₀Sn₁₀ electrode lost its catalytic activity when pure CO is used.

Keywords : Proton -Exchange Membrane Fuel Cell (PEMFC); bimetallic catalyst; electroxidation.

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