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Interfacial material for solid oxide fuel cell

Patent ·
OSTI ID:872706
 [1];  [2];  [3]
  1. Essex Junction, VT
  2. Pittsburgh, PA
  3. Murrysville, PA
+ Show Author Affiliations

Solid oxide fuel cells having improved low-temperature operation are disclosed. In one embodiment, an interfacial layer of terbia-stabilized zirconia is located between the air electrode and electrolyte of the solid oxide fuel cell. The interfacial layer provides a barrier which controls interaction between the air electrode and electrolyte. The interfacial layer also reduces polarization loss through the reduction of the air electrode/electrolyte interfacial electrical resistance. In another embodiment, the solid oxide fuel cell comprises a scandia-stabilized zirconia electrolyte having high electrical conductivity. The scandia-stabilized zirconia electrolyte may be provided as a very thin layer in order to reduce resistance. The scandia-stabilized electrolyte is preferably used in combination with the terbia-stabilized interfacial layer. The solid oxide fuel cells are operable over wider temperature ranges and wider temperature gradients in comparison with conventional fuel cells.

Research Organization:
Westinghouse Electric Corporation (Pittsburgh, PA)
DOE Contract Number:
FC21-91MC28055
Assignee:
Siemens Westinghouse Power Corporation (Orlando, FL)
Patent Number(s):
US 5993989
OSTI ID:
872706
Country of Publication:
United States
Language:
English

References (1)

Comparison of Power Densities and Chemical-Potential Variation in SOFC’s with Multi-Layer and Single-Layer Oxide Electrolytes journal January 1997

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Related Subjects

/429/427/
air
air electrode
barrier
cell
cell comprises
cells
combination
comparison
comprises
conductivity
controls
conventional
conventional fuel
disclosed
electrical
electrical conductivity
electrical resistance
electrode
electrolyte
embodiment
fuel
fuel cell
fuel cells
gradients
improved
improved low-temperature
interaction
interfacial
interfacial layer
layer
layer provides
located
loss
low-temperature
low-temperature operation
material
operable
operation
oxide
oxide fuel
polarization
preferably
provided
provides
ranges
reduce
reduces
reduction
resistance
scandia-stabilized
solid
solid oxide
stabilized zirconia
temperature
temperature gradient
temperature gradients
temperature operation
temperature range
temperature ranges
terbia-stabilized
terbia-stabilized zirconia
wider
zirconia
zirconia electrolyte