The polarization of mixed conducting SOFC cathodes: Effects of surface reaction 
coefficient, ionic conductivity and geometry

Fleig, J.; Maier, J.

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The polarization of mixed conducting SOFC cathodes: Effects of surface reaction coefficient, ionic conductivity and geometry

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Fleig, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Fleig, J., & Maier, J. (2004). The polarization of mixed conducting SOFC cathodes: Effects of surface reaction coefficient, ionic conductivity and geometry. Journal of the European Ceramic Society, 24(6), 1343-1347.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F69B-E

Abstract

Multi-dimensional finite element simulations of current distributions
in mixed ionic and electronic conducting cathodes (MIEC) are presented
for the case that the cathodic oxygen incorporation into an electrolyte
takes place through the bulk of the electrode. The effects of the ionic
conductivity and the surface reaction coefficient on the overall
process are analyzed. Depending on these material parameters different
parts of the cathode are involved in the oxide ion transport to the
electrolyte (from a very small region close to the three phase boundary
for a fast surface reaction up to the entire cathode for a very slow
surface reaction). The calculations also reveal which combinations of
ionic conductivity and surface reaction coefficient are appropriate to
achieve acceptable polarization resistances. The influence of the
particle size is discussed and interpolation formulae are given to
estimate the cathodic polarization in porous MIECs. (C) 2003 Elsevier
Ltd. All rights reserved.