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Élaborations et caractérisations électrochimiques et physiques de matériaux d'anode de PEMFC peu sensibles à l'empoisonnement par CO : étude d'alliages et de composites à base de platine-molybdène et de platine-tungstène

Abstract : PEMFC development is hindered by the CO poisoning ability of the anode platinum catalyst. It has been previously shown that the oxidation potential of carbon monoxide adsorbed on the platinum atoms can be lowered using specific Pt based catalysts, either metallic alloys or composites. The objective is then to realize a catalyst for which the CO oxidation is compatible with the working potential of a PEMFC anode. In our approach, to enhance the CO tolerance of platinum based catalyst supported on carbon, we studied platinum-tungsten and platinum-molybdenum alloys and platinum-metal oxide materials (Pt-WOx and Pt-MoOx). The platinum based alloys demonstrate a small effect of the second metal towards the oxidation of carbon monoxyde. The platinum composites show a better tolerance to carbon monoxide. Electrochemical studies on both Pt-MoOx and Pt-WOx demonstrate the abitlity of the metal-oxides to promote the ability of Pt to oxidize CO at low potentials. However, chronoamperometric tests reveal a bigger influence of the tungten oxide. Complex chemistry reactions on the molybdenum oxide surface make it more difficult to observ.
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https://tel.archives-ouvertes.fr/tel-00009835
Contributor : Eric Peyrelade <>
Submitted on : Tuesday, July 26, 2005 - 1:12:31 PM
Last modification on : Thursday, November 19, 2020 - 1:50:07 PM
Long-term archiving on: : Friday, September 14, 2012 - 2:00:26 PM

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  • HAL Id : tel-00009835, version 1

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Eric Peyrelade. Élaborations et caractérisations électrochimiques et physiques de matériaux d'anode de PEMFC peu sensibles à l'empoisonnement par CO : étude d'alliages et de composites à base de platine-molybdène et de platine-tungstène. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00009835⟩

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