Air electrode composition for solid oxide fuel cell

Patent · Thu Dec 31 23:00:00 EST 1998

OSTI ID:872422

Kuo, Lewis ^[1]; Ruka, Roswell J ^[2]; Singhal, Subhash C ^[3]

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1. Monroeville, PA
2. Pittsburgh, PA
3. Murrysville, PA

An air electrode composition for a solid oxide fuel cell is disclosed. The air electrode material is based on lanthanum manganite having a perovskite-like crystal structure ABO.sub.3. The A-site of the air electrode composition comprises a mixed lanthanide in combination with rare earth and alkaline earth dopants. The B-site of the composition comprises Mn in combination with dopants such as Mg, Al, Cr and Ni. The mixed lanthanide comprises La, Ce, Pr and, optionally, Nd. The rare earth A-site dopants preferably comprise La, Nd or a combination thereof, while the alkaline earth A-site dopant preferably comprises Ca. The use of a mixed lanthanide substantially reduces raw material costs in comparison with compositions made from high purity lanthanum starting materials. The amount of the A-site and B-site dopants is controlled in order to provide an air electrode composition having a coefficient of thermal expansion which closely matches that of the other components of the solid oxide fuel cell.

• Research Organization: Westinghouse Electric Corporation (Pittsburgh, PA)
• DOE Contract Number: FC21-91MC28055
• Assignee: Siemens Westinghouse Power Corporation (Orlando, FL)
• Patent Number(s): US 5932146
• OSTI ID: 872422
• Country of Publication: United States
• Language: English

Related Subjects

/252/204/429/
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air
air electrode
alkaline
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dopant
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lanthanide
lanthanum
lanthanum manganite
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rare
rare earth
raw
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solid oxide
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substantially
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