Solid oxide fuel cell

Patent metadata

Field	Value
Publication number	US-9269980-B2
Application number	US-201214111500-A
Country	US
Kind code	B2
Filing date	Apr 10, 2012
Priority date	Apr 12, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A solid oxide fuel cell scatters MgO over a grain boundary of an LSGM which is a solid electrolyte layer. Ni components that diffuse from a fuel electrode formed on the other side of an LDC from the LSGM are trapped by the scattered MgO particles and are suppressed from diffusing towards an air electrode in the electrolyte layer.

First claim

What is claimed is:

1. A solid oxide fuel cell comprising:
a solid electrolyte layer that is formed in a layer;
a fuel electrode that is formed on a first side of the solid electrolyte layer wherein a fuel gas flows through the fuel electrode to reach the solid electrolyte layer; and
an air electrode that is formed on a second side of the solid electrolyte layer wherein an oxidant gas flows through the air electrode to reach the solid electrolyte layer,
wherein the fuel electrode comprises at least one of Ni and NiO,
wherein the solid electrolyte layer comprises a lanthanum gallate oxide represented by a general formula of La 1-a Sr a Ga 1-b Mg b O 3 (wherein 0.05≦a≦0.3, 0≦b≦0.3) and MgO, and
wherein in the solid electrolyte layer MgO as a particulate MgO particle is spotted at a grain boundary of particles made of the lanthanum gallate oxide as a main component thereof.

2. The solid oxide fuel cell according to claim 1 , wherein a particle diameter of the MgO particle is smaller than a particle diameter of the particle made of the perovskite-type composite oxide as the main component thereof.

3. The solid oxide fuel cell according to claim 1 , wherein the MgO particle is included in the solid electrolyte layer at a rate larger than 0 vol % and equal to or smaller than 20 vol %.

4. The solid oxide fuel cell according to claim 1 , wherein the MgO particle and is unevenly distributed at the first side of the solid electrolyte layer.

5. The solid oxide fuel cell according to claim 1 , wherein at an interface between the fuel electrode and the solid electrolyte layer, a volume ratio of the particles made of the perovskite-type composite oxide as the main component thereof to the MgO particles is 80:20 to 20:80.

6. The solid oxide fuel cell according to claim 1 , comprising an intermediate layer made of a cerium oxide that includes La, between the solid electrolyte layer and the fuel electrode.

Assignees

• Momiyama Yutaka
• Kakinuma Yasuo
• Takahashi Yuya
• Ishiguro Akira
• Ando Shigeru
• Kawakami Akira
• Toto Ltd

Inventors

• Momiyama Yutaka
• Kakinuma Yasuo
• Takahashi Yuya
• Ishiguro Akira
• Ando Shigeru
• Kawakami Akira

Classifications

• H01M8/1016 Primary

  characterised by the electrolyte material (H01M8/12 takes precedence) · CPC title

• H01M4/9025 Primary

  Oxides specially used in fuel cell operating at high temperature, e.g. SOFC · CPC title

• H01M8/1246 Primary

  the electrolyte consisting of oxides · CPC title

• H01B1/08

  oxides · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title