Patent ID: 8354198

Claim:
An electrochemical device comprising: a unit cell of a solid oxide fuel cell including a solid electrolyte membrane, a fuel electrode which is integral with the solid electrolyte membrane and which comes into contact with a fuel gas for allowing reaction of the fuel gas to proceed, and an air electrode which is integral with the solid electrolyte membrane and which comes into contact with an oxygen-containing gas for allowing reaction of the oxygen-containing gas to proceed; a conductive connection member; and a bonding layer for bonding and electrically connecting the air electrode to the conductive connection member, wherein the bonding layer contains a transition metal oxide having a spinel-type crystal structure, and the air electrode includes an outer layer which is bonded to the bonding layer and which has a manganese-containing perovskite structure, wherein the air electrode includes, in addition to the outer layer, a base layer formed of lanthanum strontium cobalt ferrite represented by the chemical formula La 1−x Sr x Co 1−y Fe y O 3 (x: 0.2 to 0.5, y: 0.6 to 0.85).