Solid oxide fuel cell

Patent metadata

Field	Value
Publication number	US-9190689-B2
Application number	US-201314026401-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 28, 2012
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

An object of the present invention is to provide a fuel cell preventing formation of a diffusion layer containing Ca and other elements, and having an excellent power generation performance at low temperature by preventing breakdown of a crystal structure of an electrolyte by firing. Disclosed is a solid oxide fuel cell which includes an inner electrode, a solid electrolyte, and an outer electrode, each being sequentially laminated on the surface of a porous support. The porous support contains forsterite, and has a Mg/Si molar ratio of 1.90 to 2.2 both inclusive, and an A-to-B ratio (A/B) of 0.0% to 9.0% both inclusive, where A denotes a maximum peak height which appears at a diffraction angle 2θ=26.5° to 27.0° and B denotes a maximum peak height which appears at 36.5° to 37.0° in a powder X-ray diffraction pattern obtained by using Cu-Kα radiation.

First claim

What is claimed is:

1. A solid oxide fuel cell comprising an inner electrode, a solid electrolyte, an outer electrode, and a porous support, the inner electrode being located between the outer electrode and the porous support, the electrolyte being located between the outer electrode and the inner electrode, wherein
the solid electrolyte comprises lanthanum-gallate-based oxide doped with Sr and Mg,
the porous support comprises forsterite, and
the porous support has a Mg/Si molar ratio of 1.90 to 2.2, and an A-to-B ratio (A/B) of 0.0% to 9.0% wherein A denotes a maximum peak height which appears at a diffraction angle 2θ=26.5° to 27.0° and B denotes a maximum peak height which appears at 36.5° to 37.0° in a powder X-ray diffraction pattern obtained by using Cu-Kα radiation.

2. The solid oxide fuel cell according to claim 1 , wherein the solid electrolyte is represented by the general formula La 1-a Sr a Ga 1-b-c Mg b Co c O 3 , wherein 0.05≦a≦0.3, 0<b<0.3, and 0≦c≦0.15.

3. The solid oxide fuel cell according to claim 1 , wherein the porous support comprises a laminate including at least two layers.

4. The solid oxide fuel cell according to claim 2 , wherein the porous support comprises a laminate including at least two layers.

Assignees

• Toto Ltd

Inventors

• Ando Shigeru
• FURUYA Seiki
• Momiyama Yutaka
• Hayama Kiyoshi
• Okamoto Osamu
• Watanabe Naoki
• Isaka Nobuo
• Sato Masaki

Classifications

• Y02E60/521

  Cross-Sectional Technologies · mapped topic

• H01M8/243

  Grouping of unit cells of tubular or cylindrical configuration · CPC title

• Y02E60/525

  Cross-Sectional Technologies · mapped topic

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/0236

  Glass; Ceramics; Cermets · CPC title