High performance cathodes for solid oxide fuel cells

Details High performance cathodes for solid oxide fuel cells High performance cathodes for solid oxide fuel cells

H - Electricity

01

M

H01M 8/12 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/90 (2006.01) H01M 4/92 (2006.01)

Patent

CA 2441769

The present invention relates to a multi-layered and multifunctional cathode in solid oxide fuel cells having high conductivity, high catalytic activity, minimized coefficient of thermal expansion (CTE) mismatch, excellent compatibility to other portion of the fuel cell, and reduced temperature operation. The cathode comprises a conductive layer, a catalyst layer and a grade composition layer. The conductive layer has a first density, the catalyst layer has a second density that is less than the first density, and the graded composition layer is characterized by a graded electronic conductivity and a graded ionic conductivity.

La présente invention porte sur une cathode multicouche et multifonctionnelle de piles à combustible oxyde solide présentant une haute conductivité, une haute capacité catalytique, un coefficient réduit de l'écart de dilatation thermique, une excellente comptabilité à d'autres parties de la pile à combustible et un fonctionnement à température réduite. La cathode comprend une couche conductrice, une couche catalyseur et une couche de composition intermédiaire. La couche conductrice a une première densité, la couche catalyseur a une seconde densité inférieure à la première densité et la couche de composition progressive se caractérise par une conductivité électronique progressive et une conductivité ionique progressive.

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