Interfacial material for solid oxide fuel cell

Details Interfacial material for solid oxide fuel cell Interfacial material for solid oxide fuel cell

1997-04-07

1999-11-30

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Having earth feature

429 31, 429 33, 429 40, 427115, H01M 812, H01M 486

Patent

active

059939893

ABSTRACT:
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.

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Soral, P., et al. "Comparison of Power Densities and Chemical-Potential Variation in SOFC's with Multi-Layer and Single-Layer Oxide Electrolytes," Proceedings of the Electrochemical Society, vol. 97-40, pp. 264-273, May 1997.

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