Bilayer interconnects for solid oxide fuel cells

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A solid oxide fuel cell (SOFC) includes a plurality of sub-cells. Each sub-cell includes a first electrode in fluid communication with a source of oxygen gas, a second electrode in fluid communication with a source of a fuel gas, and a solid electrolyte between the first electrode and the second electrode. The SOFC further includes an interconnect between the sub-cells. The interconnect includes a first layer in contact with the first electrode of each sub-cell, and a second layer in contact with the second electrode of each sub-cell. The first layer includes at least one material selected from the group consisting of a doped M-ferrite based perovskite, a doped M′-ferrite based perovskite, a doped MM′-ferrite based perovskite and a doped M′-chromite based perovskite, wherein M is an alkaline earth metal and M′ is a rare earth metal. The second layer includes a doped M″-titanate based perovskite, wherein M″ is an alkaline earth metal. A solid oxide fuel cell having a plurality of cells as described above is formed by connecting each of a plurality of sub-cells with an interconnect as described above.