Components for PEM fuel cell systems using hydrogen and CO containing fuels |
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Authors: | J Divisek H-F Oetjen V Peinecke VM Schmidt U Stimming |
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Affiliation: | aInstitut für Energieverfahrenstechnik, Forschungzentrum Jülich, 52425 Jülich, Germany;bInstitut für Umwelttechnik, Fachhochschule Mannheim, Windeckstrasse 110, 69163 Mannheim, Germany;cPhysik-Department E 19, Technische Universität München, James-Frank-Strasse 1, 85748 Garching, Germany |
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Abstract: | Proton exchange membrane fuel cells (PEMFC) show a significant performance drop in CO containing hydrogen as fuel gas in comparison to pure hydrogen. The lower performance is due to CO adsorption at the anode thus poisoning the hydrogen oxidation reaction. Two approaches to improve the cell performance are discussed. First, the use of improved electrocatalysts for the anode, such as PtRu alloys, can significantly enhance the CO tolerance. On the other hand, CO poisoning of the anode could be avoided by the use of non-electrochemical methods. For example, the addition of liquid hydrogen peroxide to the humidification water of the cell leads to the formation of active oxygen by decomposition of H2O2 and the oxidation of CO. In such a way a complete recovery of the CO free cell performance is achieved for H2/100 ppm CO. |
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Keywords: | proton exchange membrane fuel cell (PEMFC) CO poisoning CO removal PtRu anodes H2O2 addition |
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