Patent ID: 7759277

Claim:
A fuel cell catalyst comprising an electrically conductive support and catalyst fine particles which are supported on said support and which are represented by the following formula (1): Pt u Ru x Ge y T z (1) in which the element represented by T is at least one selected from the group consisting of Al, Si, Ni, W, Mo, V, Ta, Ti, Hf, Sn, Zr, Nb and Cr; u is in the range of 30 to 60 atm %, x is in the range of 20 to 50 atm %, y is in the range of 0.5 to 20 atm %, and z is in the range of 0.5 to 40 atm %; wherein, in the case where said T-element in the largest amount is Al, Si, Ni, W, Mo, V or Cr, the content of the T-element's atoms connected with oxygen bonds is not more than four times as large as that of the T-element's atoms connected with metal bonds on the basis of X-ray photoelectron spectrum analysis; and in the case where said T-element in the largest amount is Ti, Hf, Sn, Ta, Zr or Nb, the content of the T-element's atoms connected with metal bonds is not more than twice as large as that of the T-element's atoms connected with oxygen bonds on the basis of X-ray photoelectron spectrum analysis.