Solid oxide fuel battery cell

Abstract

There is provided a solid oxide fuel battery cell that has a high initial power generation performance and a good power generation durability while ensuring adhesion between an air electrode layer and a current collector layer. The solid oxide fuel battery cell includes at least a solid electrolyte, a fuel electrode layer provided on one surface side of the solid electrolyte, an air electrode layer provided on the other surface side of the solid electrolyte, and a current collector layer provided on the surface of the air electrode layer, wherein the air electrode layer is formed of an oxide selected from the group consisting of lanthanum ferrite perovskite oxides, lanthanum cobalt perovskite oxides, and samarium cobalt perovskite oxides, and the current collector layer is a porous layer including silver, palladium, and an oxide and has an average porosity of 20% to 70% in a portion other than a portion near a boundary between the current collector layer and the air electrode layer and, in the near-boundary portion, an average porosity of not less than 50% of the average porosity of the portion other than the near-boundary portion.

Description

technical field [0001] The present invention relates to a single solid oxide fuel cell and a fuel cell system including the single solid oxide fuel cell. Background technique [0002] Conventionally, a fuel cell having a tubular fuel cell is known (for example, Japanese Patent Laid-Open No. 2007-95442 (Patent Document 1)). The air electrode of this conventionally known solid oxide fuel cell is formed by coating silver paste, and the silver is exposed to the air. [0003] Furthermore, Japanese Patent Application Laid-Open No. 2005-50636 (Patent Document 2) describes a flat solid oxide fuel cell in which the air electrode contact material inside the solid oxide fuel cell is isolated. The object and the air pole are sandwiched. The air electrode contact material contains at least silver powder or silver alloy powder and perovskite oxide powder. It is described that the preferred mixing ratio is in the range of silver powder or silver alloy powder:perovskite oxide powder=90:1...

AI Technical Summary

Problems solved by technology

However, this prior art does not disclose an air electrode current collector containing silver, palladium, and a perovskite-type oxide in specific content ratios.

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