Patent ID: 7462412
Filing Date: 2008-12-09
Classification: H01M,Y02E,Y02P

Abstract:
1. A solid oxide fuel cell comprising a single cell having an air electrode disposed on a surface of an electrolyte membrane and a fuel electrode disposed on the other surface of the electrolyte membrane, a fuel-electrode-side reaction layer having open pores interposed between the electrolyte membrane and the fuel electrode so as to accelerate the reaction of forming H 2 O and/or CO 2 and electron from at least hydrogen gas (H 2 ) and/or carbon monoxide gas (CO) contained in fuel gas, and oxygen ion (O 2− ), and an interconnector having a role of electrical connection; wherein the electrolyte membrane is provided with a first layer composed of a material having an oxygen-ionic conductivity of S1 on the air-electrode side, a third layer composed of a material having an oxygen-ionic conductivity of S3 on the fuel-electrode side, and a second layer composed of a material containing at least zirconia and having an oxygen-ionic conductivity of S2 between the first layer and the third layer; wherein the oxygen-ionic conductivity of S1 and the oxygen-ionic conductivity of S2 have a relationship of S1>S2, and the oxygen-ionic conductivity of S3 and the oxygen-ionic conductivity of S2 have a relationship of S3>S2; and wherein the fuel-electrode-side reaction layer comprises a layer in which NiO and scandia-doped zirconia are evenly mixed, or Ni and scandia-doped zirconia are evenly mixed.