Solid oxide fuel cell

Abstract

The present invention provides a solid oxide fuel cell (SOFC) including a porous fuel electrode which allows reaction of a fuel gas to proceed and which is formed of Ni and YSZ, a porous air electrode which allows reaction of an oxygen-containing gas to proceed, and a dense solid electrolyte membrane which is provided between the fuel electrode and the air electrode and which has an interface with the fuel electrode. In the fuel electrode, Ni grains present in a region located within 3 μm from the interface (i.e., a “near-interface region”) have a mean size of 0.28 to 0.80 μm, YSZ grains present in the near-interface region have a mean size of 0.28 to 0.80 μm, and pores present in the near-interface region have a mean size of 0.10 to 0.87 μm. Thus, the fuel electrode of the SOFC exhibits low reaction resistance.

Dependencies are inferred from the claim text.