Fuel cell and method of producing the fuel cell

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.