A Multiphysics Modeling Study of (Pr0.7Sr0.3)MnO3±δ8mol% Yttria-Stabilized Zirconia Composite Cathodes for Solid Oxide Fuel Cells

[+] Author and Article Information
Ke An

 Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 kean@vt.edu

Kenneth L. Reifsnider

 Connecticut Global Fuel Cell Center, University of Connecticut, Storrs, CT 06269

J. Fuel Cell Sci. Technol 2(1), 45-51 (Oct 25, 2004) (7 pages) doi:10.1115/1.1842782 History: Received June 02, 2004; Revised October 25, 2004

Solid oxide fuel cells (SOFCs) are expected to be a future power source. Simulation analyses of SOFCs can help to understand well the interactive functions among the multiphysics phenomena in the SOFC system. A three-dimensional multiphysics finite-element model was used to simulate the performance of a half-cell SOFC with (Pr0.7Sr0.3)MnO3±δ8mol% yttria-stabilized zirconia (8YSZ) composite cathode on one side of the 8YSZ electrolyte before and after aging. Multiphysics phenomena in the SOFC were considered in the modeling. The current/voltage curves simulated matched the experimental data before and after aging. The average current density was found to have a linear relationship to the logarithm of the effective exchange current density. The effect of the effective ionic conductivity of the composite cathode was more apparent for small total effective ionic conductivity values than for large ones.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

3-D geometry of the SOFC

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Figure 2

I–V curves comparison of simulation and experiment

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Figure 3

Oxygen concentration in the cathode (mol∕m3)

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Figure 4

Oxygen concentration in the cathode through the symmetric line

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Figure 5

Voltage distribution of the cathode with the interface on top (V)

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Figure 6

Electronic current density distribution of the cathode (A∕m2)

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Figure 7

Current density distribution of the cathode (A∕m2)

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Figure 8

Current density in the cathode along line ([45.50][45.52])×10−5

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Figure 9

Overpotential (ϕel,c−ϕion,c) along line ([45.50][45.52])×10−5

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Figure 10

Overpotential (ϕel,c−ϕion,c) at point [45.51]×10−5

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Figure 11

Average current density versus the product of exchange current density and specific surface area

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Figure 12

Average current density versus the effective ionic conductivity



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