The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1994
Filed:
Mar. 26, 1992
Shoji Seike, Nagoya, JP;
Hirotake Yamada, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
An air electrode as a component of a solid electrolyte fuel cell. The air electrode is composed of a first layer and a second layer. The first layer has an open porosity of 25% to 57%, pore diameters of 2.5 .mu.m to 12 .mu.m and a resistivity of less than 0.22 .OMEGA.cm. The second layer has an open porosity of 8% to 24%, pore diameters of 0.2 .mu.m to 3 .mu.m, and a ratio of the thickness of the second layer to the thickness of the air electrode is 2% to 28%. The sum of the thicknesses of the first and second layers is 0.7 mm to 3.0 mm. The materials of the first and second layers have perovskite structures selected from the group consisting of lanthanum manganate, calcium manganate, lanthanum nickelate, lanthanum cobalate and lanthanum chromate. A solid electrolyte fuel cell includes the air electrode as described above, a solid electrolyte film formed on the surface of the second layer of the air electrode and a fuel electrode film formed on the surface of the solid electrolyte film.