Single cell for a solid oxide fuel cell

A single cell for a solid oxide fuel cell comprising:

• a first solid electrolyte showing oxide ion conductivity;
• a fuel electrode comprised of a cermet of a catalyst and a second solid electrolyte, the fuel electrode being bonded to one side of the first solid electrolyte;
• and
• an air electrode comprised of a compound of perovskite type transition metal oxide with a third solid electrolyte, the air electrode being bonded to the other side of the first solid electrolyte,
• wherein
• the first solid electrolyte shows oxide ion conductivity at 1000° C. of 0.07 S/cm or more, and bending strength at ambient temperature of 700 MPa or more, and the second solid electrolyte shows oxide ion conductivity at 1000° C. of 0.20 S/cm or more,
• a surface of the fuel electrode is coated with a fuel electrode contact layer comprised of a fuel electrode contact material containing metal particles, and a surface of the air electrode is coated with an air electrode contact layer comprised of an air electrode contact material containing a material of which electric conductivity in a temperature region for power generation is higher than electric conductivity of an air electrode material, and
• an aqueous solution where a water-soluble noble metal compound is dissolved in water is previously impregnated into the air electrode.