Air electrode and solid electrolyte fuel cell having the same

Details Air electrode and solid electrolyte fuel cell having the same Air electrode and solid electrolyte fuel cell having the same

1992-03-26

1994-05-03

Chaudhuri, Olik

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 40, H01M 810

Patent

active

053087127

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.

REFERENCES:
patent: 3804674 (1974-04-01), Kudo et al.
patent: 5114803 (1992-05-01), Ishihara et al.
Chemical Abstracts, Abstract No. 250734x, vol. 114, No. 26, Jul. 1, 1991 Columbus, Ohio, "Manufacture of Solid-Electrolyte Fuel Cells", Yamanochi Hiroshi et al.
Chemical Abstracts, Abstract No. 100269y, vol. 111, No. 6, Sep. 18, 1989 Columbus, Ohio, "Ca1-xCexMnO3 as New Air Electrode Materials for SOFC", Iwahara Hiroyasu et al.
Patent Abstracts of Japan, vol. 15, No. 308 (E-1097), Aug. 1991.
Patent Abstracts of Japan, vol. 13, No. 548 (E-856)(3896), Dec. 1989.

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