Patent ID: 7563394

Claim:
A polymer fuel cell-oriented Pt/CeO 2 /electroconductive carbon type nano-hetero anode material characterized in that the nano-hetero anode material is represented by a general formula: X*Pt/Y*CeO 2 /Z*CARBON (where X, Y, and Z are content ratios by weight of platinum Pt, CeO 2 , and CARBON; 0.1≦X≦0.4, 0.1≦Y≦0.4, and Z=1−X−Y; and CARBON represents electroconductive carbon); and that the nano-hetero anode material comprises: an undoped CeO 2 powder including nano-size particles free of components such as rare earth elements dissolved therein in a solid state, wherein the nano-size particles have primary particle diameters between 10 nanometers inclusive and 50 nanometers inclusive and secondary particle diameters between 60 nanometers inclusive and 300 nanometer inclusive, wherein a numerical percentage of spherical particles based on spherical and columnar particles is 50% or more, and wherein the columnar particles have aspect ratios of 20 or less and breadths of 300 nanometers or shorter in minor axis directions; platinum particles having primary particle diameters of 50 nanometers or less and secondary particle diameters of 300 nanometers or less; and electroconductive carbon as a balance component.