Air electrode composition for solid oxide fuel cell

Patent · Fri Jan 01 00:00:00 EST 1999

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 Corp., Pittsburgh, PA (United States)
• 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

air
electrode
composition
solid
oxide
fuel
cell
disclosed
material
based
lanthanum
manganite
perovskite-like
crystal
structure
a-site
comprises
mixed
lanthanide
combination
rare
earth
alkaline
dopants
b-site
mn
mg
optionally
preferably
comprise
dopant
substantially
reduces
raw
costs
comparison
compositions
purity
starting
materials
amount
controlled
provide
coefficient
thermal
expansion
closely
matches
components
closely matches
fuel cell
substantially reduces
starting material
composition comprises
air electrode
thermal expansion
alkaline earth
oxide fuel
solid oxide
rare earth
electrode material
preferably comprises
starting materials
crystal structure
electrode composition
raw material
substantially reduce
lanthanum manganite
perovskite-like crystal
closely match
preferably comprise
/252/204/429/