Patent ID: 7326484

Claim:
A single cell, comprising: (a) a solid electrolyte layer; (b) an air electrode formed on one surface of the solid electrolyte layer; and (c) a fuel electrode comprising: an adhering anode layer formed on the other surface of the solid electrolyte layer and configured to show a function to allow the air electrode and the solid electrolyte layer to adhere electrically and mechanically to each other; and an electricity collecting anode layer formed on the adhering anode layer and configured to show an electricity collecting function, wherein the adhering anode layer is configured to provide a field for a three-phase interface composed of the solid electrolyte layer, reactive gas and the fuel electrode, the electricity collecting anode layer is thicker than the adhering anode layer, and has pores providing the reactive gas to the three-phase interface, and the thickness (ta 1 ) of the adhering anode layer and an average diameter (da) of constituent particles of the fuel electrode satisfy a relation selected from the group of ta 1 ≦da and 0.01 da≦ta 1 ≦0.5 da.