Patent ID: 6893765

Claim:
A polymer electrolyte fuel cell comprising: a polymer electrolyte membrane; an anode and a cathode sandwiching said polymer electrolyte membrane therebetween; an anode-side conductive separator plate having a gas channel for supplying a fuel gas to said anode; and a cathode-side conductive separator plate having a gas channel for supplying an oxidant gas to said cathode, wherein each of said anode-side and cathode-side conductive separator plates comprises a metal plate, an oxidation-resistant conductive film covering partially or entirely a surface of said metal plate facing said anode or cathode, and a diffused layer resulting from diffusion of a material of said conductive film at an interface between said metal plate and conductive film, and said conductive film comprises a nitride or carbide of an element selected from the group consisting of Ti, Cr, Zr, Al, Ta and W, or a noble metal.