Cathode catalyst for fuel cell, and membrane-electrode assembly for fuel cell and fuel cell system including same

A membrane-electrode assembly for a fuel cell, comprising:

• a cathode, wherein the cathode comprises a cathode catalyst which includes an A-B-Ch compound, where A is a metal selected from the group consisting of Pt, Ru, Rh, and combinations thereof, B is a metal selected from the group consisting of Bi, Pb, Tl, Sb, Sn, In, Ga, Ge, and combinations thereof, and Ch is an element selected from the group consisting of S, Se, Te, and combinations thereof;
• an anode facing the cathode;
• and
• an electrolyte interposed between the anode and cathode.

A fuel cell system comprising:

• a fuel supplier for supplying a fuel to an electricity generating element;
• an oxidant supplier for supplying an oxidant to an electricity generating element;
• and
• at least one electricity generating element for generating electricity from electrochemical reactions of a fuel and an oxidant, comprising
• a membrane-electrode assembly comprising:
• a cathode, wherein the cathode comprises a cathode catalyst which includes an A-B-Ch compound, where A is a metal selected from the group consisting of Pt, Ru, Rh, and combinations thereof, B is a metal selected from the group consisting of Bi, Pb, Tl, Sb, Sn, In, Ga, Ge, and combinations thereof, and Ch is an element selected from the group consisting of S, Se, Te, and combinations thereof;
• an anode facing the cathode;
• and
• a polymer electrolyte membrane interposed between the anode and the cathode.