Authors: | Schweizer, Ben Mihailovici, Michaela |
Title: | Effective model for the cathode catalyst layer in fuels cells |
Language (ISO): | en |
Abstract: | 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. |
Subject Headings: | homogenization surface reaction effective equation fuel cell |
URI: | http://hdl.handle.net/2003/25410 http://dx.doi.org/10.17877/DE290R-156 |
Issue Date: | 2008-03-25 |
Provenance: | IOS Press |
URL: | http://dx.doi.org/10.3233/ASY-2008-0876 |
Citation: | 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 |
Appears in Collections: | Schweizer, Ben Prof. Dr. |
Files in This Item:
File | Description | Size | Format | |
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EffectiveModelForTheCathodeCatalystLayer.pdf | 289.59 kB | Adobe PDF | View/Open |
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