Low cost stable air electrode material for high temperature solid oxide electrolyte electrochemical cells

Patent · Tue Dec 31 23:00:00 EST 1996

OSTI ID:871222

Kuo, Lewis J. H. ^[1]; Singh, Prabhakar ^[2]; Ruka, Roswell J ^[3]; Vasilow, Theodore R ^[4]; Bratton, Raymond J ^[5]

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1. Monroeville, PA
2. Export, PA
3. Churchill Boro, PA
4. Penn Township, PA
5. Delmont, PA

A low cost, lanthanide-substituted, dimensionally and thermally stable, gas permeable, electrically conductive, porous ceramic air electrode composition of lanthanide-substituted doped lanthanum manganite is provided which is used as the cathode in high temperature, solid oxide electrolyte fuel cells and generators. The air electrode composition of this invention has a much lower fabrication cost as a result of using a lower cost lanthanide mixture, either a natural mixture or an unfinished lanthanide concentrate obtained from a natural mixture subjected to incomplete purification, as the raw material in place of part or all of the higher cost individual lanthanum. The mixed lanthanide primarily contains a mixture of at least La, Ce, Pr, and Nd, or at least La, Ce, Pr, Nd and Sm in its lanthanide content, but can also include minor amounts of other lanthanides and trace impurities. The use of lanthanides in place of some or all of the lanthanum also increases the dimensional stability of the air electrode. This low cost air electrode can be fabricated as a cathode for use in high temperature, solid oxide fuel cells and generators.

• Research Organization: Westinghouse Electric Corporation (Pittsburgh, PA)
• DOE Contract Number: FC21-91MC28055
• Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
• Patent Number(s): US 5686198
• OSTI ID: 871222
• Country of Publication: United States
• Language: English

Related Subjects

/429/264/
air
air electrode
amounts
cathode
cells
ceramic
composition
concentrate
conductive
contains
content
cost
dimensional
dimensionally
doped
doped lanthanum
electrically
electrically conductive
electrochemical
electrochemical cell
electrochemical cells
electrode
electrode composition
electrode material
electrolyte
electrolyte electrochemical
electrolyte fuel
fabricated
fabrication
fabrication cost
fuel
fuel cell
fuel cells
gas
gas permeable
generators
impurities
incomplete
increases
individual
lanthanide
lanthanide-substituted
lanthanides
lanthanum
lanthanum manganite
manganite
material
minor
minor amount
minor amounts
mixed
mixture
natural
obtained
oxide
oxide electrolyte
oxide fuel
permeable
porous
porous ceramic
primarily
provided
purification
raw
raw material
result
solid
solid oxide
stability
stable
subjected
temperature
temperature solid
thermally
thermally stable
trace
trace impurities
unfinished