Stoffübertragung

Schönbucher, Axel

doi:10.1007/978-3-642-56308-9_3

Cited by 1 publication

(1 citation statement)

References 34 publications

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“…[1] This approach takes the interaction of oxygen molecules with the pore walls into account via the Knudsen diffusion coefficient D K , which is dependent on the pore radius. The diffusion coefficient D O2N2 is calculated after Fuller (6). The equation further depends on temperature T, ideal gas constant R and the molar masses M i .…”

Section: Model Processesmentioning

confidence: 99%

3D-Modelling and Performance Evaluation of Mixed Conducting (MIEC) Cathodes

Rüger

Weber²,

Ivers‐Tiffée³

2007

ECS Trans.

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Mixed electronic/ionic conducting (MIEC) cathode materials are qualified for the application in intermediate-temperature SOFCs. The area specific resistance of MIEC cathodes is likewise determined by chemical composition and microstructure. A three-dimensional finite element method model, which is capable to analyze and predict the performance of MIEC cathodes, was developed. Representations for the actual cathode microstructure are automatically generated according to characteristic measures like cathode thickness, composition, porosity and average particle size. The model calculates the spatial distributions of the oxygen activity, the diffusive oxygen flux in the pores as well as the ionic current density inside the MIEC-cathode and inside the electrolyte material. Based on these values the area specific resistance of the cathode and the penetration depth of the ionic current can be evaluated. This paper will analyze the effect of surface-exchange kO and bulk-diffusion coefficient DO as well as the influence of microstructure properties on the cathode performance.

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Section: Model Processesmentioning

confidence: 99%