Structure

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Perovskite structures are provided for use in fuel cells. Specifically, perovskite structures are provided for use as electrodes in solid oxide fuel cells (SOFCs) and methods of making the same. The perovskite structure may include a first element X, strontium, iron, cobalt, oxygen and tungsten; wherein the first element X is barium, a lanthanide, or a mixture thereof, and wherein the structure comprises a region of single perovskite and a region of double perovskite.