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Abstract

In one aspect of the invention, an air electrode material for a solid oxide fuel cell comprises Y.sub.1-a Q.sub.a MnO.sub.3, where 'Q' is selected from the group consisting of Ca and Sr or mixtures thereof and 'a' is from 0.1 to 0.8. Preferably, 'a' is from 0.4 to 0.7. In another aspect of the invention, an electrical interconnection material for a solid oxide fuel cell comprises Y.sub.1-b Ca.sub.b Cr.sub.1-c Al.sub.c O.sub.3, where 'b' is from 0.1 to 0.6 and 'c' is from 0 to 9.3. Preferably, 'b' is from 0.3 to 0.5 and 'c' is from 0.05 to 0.1. A composite solid oxide electrochemical fuel cell incorporating these materials comprises: a solid oxide air electrode and an adjacent solid oxide electrical interconnection which commonly include the cation Y, the air electrode comprising Y.sub.1-a Q.sub.a MnO.sub.3, where 'Q' is selected from the group consisting of Ca and Sr or mixtures thereof and 'a' is from 0.1 to 0.8, the electrical interconnection comprising Y.sub.1-b Ca.sub.b Cr.sub.1-c Al.sub.c O.sub.3, where 'b' is from 0.1 to 0.6 and 'c' is from 0.0 to 0.3; a yttrium stabilized solid electrolyte comprising (1-d)ZrO.sub.2 -(d)Y.sub.2 O.sub.3 where 'd' is from 0.06 to 0.5; and a solid fuel electrode comprising X-ZrO.sub.2, where 'X' is an elemental metal.

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First Claim