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Química Nova

versión impresa ISSN 0100-4042

Resumen

PEREIRA, Luis Gustavo da Silva; PEREIRA, Maristela Elisabete  y  TICIANELLI, Edson Antonio. The effect of M/C (M = Mo, Cu, Fe and W) in the diffusion layer of gas diffusion electrodes on the hydrogen oxidation reaction in the presence of carbon monoxide. Quím. Nova [online]. 2007, vol.30, n.7, pp. 1644-1648. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422007000700027.

The performance of proton exchange membrane fuel cells (PEMFC) with Pt-based anodes is drastically lowered when CO-containing hydrogen is used to feed the system, because of the strong adsorption of CO on platinum. In the present work the effects of the presence of a conversion layer of CO to CO2 composed by several M/C materials (where M = Mo, Cu, Fe and W) in gas diffusion anodes formed by Pt catalysts were investigated. The diffusion layers formed by Mo/C e W/C show good CO-tolerance, and this was attributed to the CO removal by parallel occurrence of the water-gas shift reaction and the so-called bifunctional mechanism.

Palabras llave : PEMFC; carbon monoxide; water-gas shift.

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