Patent ID: 8507145

Claim:
A fuel cell comprising an electrolyte electrode assembly and separators sandwiching the electrolyte electrode assembly, the electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between the anode and the cathode, a fuel gas being supplied from a central region to an outer region of the anode, an oxygen-containing gas being supplied along the cathode, and an exhaust gas as mixture of the fuel gas and the oxygen-containing gas after consumption being discharged to an outside from an outer region of the electrolyte electrode assembly, the fuel cell further comprising: a first protection layer formed on a surface of the anode facing the separator for preventing the anode from being exposed to the exhaust gas; and a second protection layer formed on a surface of the separator facing the anode for preventing the separator from being exposed to the exhaust gas, wherein the first protection layer and the second protection layer tightly contact each other in part so as to form a space as a fuel gas channel for supplying the fuel gas to the anode, between the first protection layer and the second protection layer, and wherein the second protection layer is a gradient layer having composition ratios of Ni and Fe, wherein an amount of Ni decreases gradually in a direction from the anode to the separator and an amount of Fe increases gradually in the direction from the anode to the separator.