Lanthanum manganite-based air electrode for solid oxide fuel cells

Patent · 31 December 1998

OSTI ID:872355

Ruka, Roswell J ^[1]; Kuo, Lewis ^[2]; Li, Baozhen ^[3]

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1. Pittsburgh, PA
2. Monroeville, PA
3. Essex Junction, VT

An air electrode material for a solid oxide fuel cell is disclosed. The electrode material is based on lanthanum manganite having a perovskite-like crystal structure ABO.sub.3. The A-site of the air electrode material preferably comprises La, Ca, Ce and at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd. The B-site of the electrode material comprises Mn with substantially no dopants. The ratio of A:B is preferably slightly above 1. A preferred air electrode composition is of the formula La.sub.w Ca.sub.x Ln.sub.y Ce.sub.z MnO.sub.3, wherein Ln comprises at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd, w is from about 0.55 to about 0.56, x is from about 0.255 to about 0.265, y is from about 0.175 to about 0.185, and z is from about 0.005 to about 0.02. The air electrode material possesses advantageous chemical and electrical properties as well as favorable thermal expansion and thermal cycle shrinkage characteristics.

• Research Organization: Westinghouse Electric Corporation (Pittsburgh, PA)
• DOE Contract Number: FC21-91MC28055
• Assignee: Siemens Westinghouse Power Corporation (Orlando, FL)
• Patent Number(s): US 5916700
• OSTI ID: 872355
• Country of Publication: United States
• Language: English

Related Subjects

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005
02
175
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a-site
advantageous
air
air electrode
b-site
based
cell
cells
characteristics
chemical
composition
comprises
crystal
crystal structure
cycle
disclosed
dopants
electrical
electrical properties
electrode
electrode composition
electrode material
expansion
favorable
formula
fuel
fuel cell
fuel cells
gd
lanthanide
lanthanum
lanthanum manganite
ln
manganite
manganite-based
material
material comprises
material preferably
mn
mno
oxide
oxide fuel
perovskite-like
perovskite-like crystal
possesses
preferably
preferably comprise
preferably comprises
preferred
properties
ratio
selected
shrinkage
slightly
solid
solid oxide
structure
substantially
thermal
thermal cycle
thermal expansion
z