Forschungszentrum Juelich Gmbh

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Plansee Composite Materials Gmbh

Plansee Se

Matthias Ruettinger

Thomas Franco

Hans Peter Buchkremer

Marco Brandner

Thomas Jung

Andreas Venskutonis

Sven Uhlenbruck

Kai Ortner

Markus Haydn

Norbert H Menzler

Robert Muecke

A cathode-electrolyte-anode unit for an electrochemical functional device, in particular a high-temperature fuel cell. The unit has a multi-layer solid-state electrolyte arranged between a porous anode and a porous cathode. The solid-state electrolyte is produced by a vapor deposition process and has a sandwich-type structure consisting of at least one first layer with a lower oxygen content, and at least one second layer with a higher oxygen content. The individual layers have substantially the same composition, with the exception of oxygen.

Multi-layered layer arrangement for a solid electrolyte

The substrate-supported anode for a high-temperature fuel cell comprises an at least three-layer anode laminate on a metallic substrate. Each of the layers of the anode laminate comprises yttria-stabilized zirconia and nickel, wherein the mean particle size of the nickel decreases from one layer to the next as the distance from the substrate increases. The last layer of the anode laminate, which is provided for contact with the electrolyte, has a root mean square roughness of less than 4 &#x3bc;m. The overall mean pore size of this layer is typically between 0.3 and 1.5 &#x3bc;m. Starting powders having a bimodal particle size distribution of yttria-stabilized zirconia and nickel-containing powder are used at least for the first and second layers of the anode laminate. The mean particle size of the nickel-containing powder is reduced from one layer to the next, whereby it is advantageously no more than 0.5 &#x3bc;m in the last layer of the anode laminate.

Anode for a high-temperature fuel cell and production thereof

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Reutte, Austria

Matthias Ruettinger