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

Titelangaben

Gerk, Christian ; Willert-Porada, Monika:
Application of Eutectic Ceramic Mixtures for the Functional Components of High Temperature Sofc's.
In: MRS Online Proceedings Library. Bd. 496 (1997) . - S. 179-184.
ISSN 1946-4274
DOI: https://doi.org/10.1557/PROC-496-179

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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.