Autor(en): | Schweizer, Ben Mihailovici, Michaela |
Titel: | Effective model for the cathode catalyst layer in fuels cells |
Sprache (ISO): | en |
Zusammenfassung: | We study a pore scale model for the catalyst layer on the cathod e side of a fuel cell, where hydrogen and oxygen combine at catalyst sites. Our model distinguishes microscopically the phases of rigid structure, electrolyte, pore-space, and catalyst. The oxygen concentration and the protonic potential are described by diffu sion equations with reaction terms on the catalyst's surface. For the limit of a vanishing pore size we derive homogenized equations of reaction-diffusion type and provide formulae for the effective coeffici ents. A dimensional reduction shows that a thin catalyst layer can be replaced by a boundary condition. We furthermore analyze the effect of a doubling of the Tafel slope for high protonic potentials and determine effective constants. |
Schlagwörter: | homogenization surface reaction effective equation fuel cell |
URI: | http://hdl.handle.net/2003/25410 http://dx.doi.org/10.17877/DE290R-156 |
Erscheinungsdatum: | 2008-03-25 |
Provinienz: | IOS Press |
URL: | http://dx.doi.org/10.3233/ASY-2008-0876 |
Zitierform: | Mihailovici, Michaela; Schweizer, Ben: : Effective model for the cathode catalyst layer in fuels cells. In: Asymptotic Analysis Nr. 1-2, Jg. 57(2008), S. 105-123, preprint |
Enthalten in den Sammlungen: | Schweizer, Ben Prof. Dr. |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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EffectiveModelForTheCathodeCatalystLayer.pdf | 289.59 kB | Adobe PDF | Öffnen/Anzeigen |
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