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Application of Eutectic Ceramic Mixtures for The Functional Components of High Temperature Sofc's

Published online by Cambridge University Press:  10 February 2011

Ch. Gerk and
M. Willert-Porada
Ch. Gerk
Affiliation:
Dept. Chem. Eng., Div. of Mater. Sci., University of Dortmund, D-44221 Dortmund, F.R. Germany, wipo@chemietechnik.uni-dortmund.de
M. Willert-Porada
Affiliation:
Dept. Chem. Eng., Div. of Mater. Sci., University of Dortmund, D-44221 Dortmund, F.R. Germany, wipo@chemietechnik.uni-dortmund.de
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Abstract

A novel design for a high temperature SOFC, based on lamellar electrode-electrolyte segments obtained by solidification of an oxidic eutectic melt on an electrolyte substrate is presented. Such “composite” electrodes contain NiO or MnO - 8Y-ZrO2 lamellae, which after reduction / oxidation yield electrode-electrolyte lamellae with 1–2 μm width and a vertical dimension of> 100 μm, depending upon the amount of eutectic melt solidified on a polycrystalline substrate. The nucleation of the eutectic on a polycrystalline substrate followed by a semi-directional crystallization of the two phases yields a gradient of 3-phase boundaries over the height of such an electrode, with the number of 3-phase boundaries increasing towards the substrate.

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