Patent ID: 8257882

Claim:
A cathode for a fuel cell comprising: a proton conducting electrolytic membrane on which the cathode is formed; a complex oxide having primarily oxygen ion conductivity; an inorganic material having primarily electron conductivity, wherein the complex oxide and the inorganic material have conductive paths that are continuous in a thicknesswise direction of the cathode, respectively; and an oxygen dissociation catalyst having greater catalyst activity in an oxygen dissociation reaction than the complex oxide and the inorganic material at a predetermined temperature range, wherein a compositional ratio between the complex oxide and the inorganic material is 3:7 to 7:3, inorganic material:complex oxide, when a particle diameter of either the inorganic material or the complex oxide is about a same order of magnitude of, a particle diameter of the other of the inorganic material or the complex oxide respectively, wherein the complex oxide forms: a lowermost row adjacent the electrolytic membrane; an outermost row opposite the lowermost row; and two intermediate rows between the lowermost row and the outermost row, each complex oxide of the lowermost row is configured to support four catalysts, each complex oxide of the two intermediate rows is configured to support two catalysts, and each complex oxide of the outermost row is configured to support zero catalysts.