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Title: Interfacial material for solid oxide fuel cell

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.
Authors:
 [1] ;  [2] ;  [3]
  1. (Essex Junction, VT)
  2. (Pittsburgh, PA)
  3. (Murrysville, PA)
Publication Date:
OSTI Identifier:
872706
Report Number(s):
US 5993989
DOE Contract Number:
FC21-91MC28055
Resource Type:
Patent
Research Org:
Westinghouse Electric Corporation (Pittsburgh, PA)
Country of Publication:
United States
Language:
English
Subject:
interfacial; material; solid; oxide; fuel; cell; solid; oxide; fuel; cells; improved; low-temperature; operation; disclosed; embodiment; interfacial; layer; terbia-stabilized; zirconia; located; air; electrode; electrolyte; solid; oxide; fuel; cell; interfacial; layer; provides; barrier; controls; interaction; air; electrode; electrolyte; interfacial; layer; reduces; polarization; loss; reduction; air; electrode; electrolyte; interfacial; electrical; resistance; embodiment; solid; oxide; fuel; cell; comprises; scandia-stabilized; zirconia; electrolyte; electrical; conductivity; scandia-stabilized; zirconia; electrolyte; provided; layer; reduce; resistance; scandia-stabilized; electrolyte; preferably; combination; terbia-stabilized; interfacial; layer; solid; oxide; fuel; cells; operable; wider; temperature; ranges; wider; temperature; gradients; comparison; conventional; fuel; cells; temperature ranges; interfacial layer; interfacial layer; interfacial layer; interfacial layer; fuel cell; fuel cell; fuel cell; fuel cell; fuel cell; fuel cell; temperature operation; cell comprises; temperature gradient; air electrode; air electrode; air electrode; temperature range; fuel cells; fuel cells; fuel cells; oxide fuel; oxide fuel; oxide fuel; oxide fuel; oxide fuel; solid oxide; solid oxide; solid oxide; solid oxide; solid oxide; electrical resistance; electrical conductivity; stabilized zirconia; stabilized zirconia; stabilized zirconia; zirconia electrolyte; zirconia electrolyte; layer provides; temperature gradients; conventional fuel; terbia-stabilized zirconia; improved low-temperature; low-temperature operation /429/427/