Fuel cell

Abstract

The fuel cell has an anode, a cathode, and a solid electrolyte layer. The cathode contains a main component configured by a perovskite oxide which is expressed by the general formula ABO3 and includes at least Sr at the A site. The solid electrolyte layer is disposed between the anode and the cathode. The cathode has a surface region and an inner region. The surface region is within 5 μm from a surface opposite the solid electrolyte layer. The inner region is formed on a solid electrolyte layer side of the surface region. The surface region and the inner region respectively include a main phase configured by the perovskite oxide and a secondary phase configured by strontium sulfate. An occupied surface area ratio of the secondary phase in a cross section of the surface region is greater than an occupied surface area ratio of the secondary phase in a cross section of the inner region.

Dependencies are inferred from the claim text.