Patent ID: 7955757

Claim:
A membrane-electrode assembly comprising a cathode catalyst layer for reducing an oxidant gas, a polymer electrolyte membrane and an anode catalyst layer, the polymer electrolyte membrane being sandwiched between the cathode catalyst layer and the anode catalyst layer, wherein the cathode catalyst layer exhibits super-water-repellency, and wherein the cathode catalyst layer has a portion with at least one member selected from the group consisting of silicon compounds having perfluoropolyether chains represented by: F{CF(CF 3 )—CF 2 O} n —CF(CF 3 )—CONH—(CH 2 ) 3 —Si(OCH 2 CH 3 ) 3 , F{CF(CF 3 )—CF 2 O} n —CF(CF 3 )—CONH—(CH 2 ) 3 —Si(OCH 3 ) 3 , F{CF(CF 2 CF 2 O) n —CF 2 CF 2 —CONH—(CH 2 ) 3 —Si(OCH 2 CH 3 ) 3 , and F(CF 2 CF 2 CF 2 O) n —CF 2 CF 2 —CONH—(CH 2 ) 3 —Si(OCH 3 ) 3 .