Fuel Cell Electrode Catalyst with Reduced Noble Metal Amount and Solid Polymer Fuel Cell Comprising the Same

Abstract

An object of the present invention is to reduce the amount of catalytic metal such as Pt in a fuel cell. The present invention provides a fuel cell electrode catalyst comprising a conductive carrier and catalytic metal particles, wherein the CO adsorption amount of the electrode catalyst is at least 30 mL/g·Pt.

1 . A fuel cell electrode catalyst comprising a conductive carrier and catalytic metal particles, characterized in that the CO adsorption amount of the electrode catalyst is at least 30 mL/g·Pt. 
     
     
         2 . The fuel cell electrode catalyst according to  claim 1 , characterized in that the catalytic metal is at least one selected from the group consisting of noble metal, noble metal-rare earth, noble metal-transition metal, and noble metal-transition metal-rare earth. 
     
     
         3 . The fuel cell electrode catalyst according to  claim 1  or  2 , characterized in that the conductive carrier has a specific surface area of at least 650 m 2 /g. 
     
     
         4 . The fuel cell electrode catalyst according to any of  claims 1  to  3 , characterized in that the amount of catalytic metal per 1 cm 2  of the electrode is at most 0.0001 mg. 
     
     
         5 . The fuel cell electrode catalyst according to any of  claims 1  to  4 , characterized by being an anode catalyst. 
     
     
         6 . A solid polymer fuel cell having an anode, a cathode, and a polymer electrolyte membrane located between the anode and the cathode, characterized comprising by the fuel cell electrode catalyst according to any of  claims 1  to  5  as an electrode catalyst for the cathode and/or anode. 
     
     
         7 . A solid polymer fuel cell characterized by comprising the fuel cell electrode catalyst according to any of  claims 1  to  5  as an anode electrode catalyst. 
     
     
         8 . A method for evaluating a fuel cell electrode catalyst comprising a conductive carrier and catalytic metal particles, the method using the CO adsorption amount of the electrode catalyst as an index.