Cathode electrode design for electrochemical fuel cells
AssigneeBallard Power Systems Inc.
InventorsSiyu Ye, Alexander Man-Chung Leung, Kyoung Bai, Dustin William H. Banham, Alan Young
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Abstract
A membrane electrode assembly including: an anode electrode; a cathode electrode; and a polymer electrolyte membrane; wherein the cathode includes a first cathode catalyst sublayer including a first precious metal catalyst composition and a first ionomer composition including a first ionomer and a second ionomer; and a second cathode catalyst sublayer including a second precious metal catalyst composition and a second ionomer composition including a third ionomer; wherein the first ionomer is different from the second ionomer in at least one of chemical structure and equivalent weight.
Claims14
A membrane electrode assembly comprising:
- an anode electrode comprising an anode gas diffusion layer and an anode catalyst layer;
- a cathode electrode comprising a cathode gas diffusion layer and a cathode catalyst layer;
- and
- a polymer electrolyte membrane interposed between the anode catalyst layer and the cathode catalyst layer;
- wherein the cathode catalyst layer comprises:
- a first cathode catalyst sublayer adjacent the polymer electrolyte membrane, the first cathode catalyst sublayer comprising a first precious metal catalyst composition and a first ionomer composition comprising a first ionomer and a second ionomer;
- and
- a second cathode catalyst sublayer adjacent the cathode gas diffusion layer, the second cathode catalyst sublayer comprising a second precious metal catalyst composition and a single, second ionomer composition comprising a single, third ionomer;
- wherein the first ionomer is different from the second ionomer in at least one of chemical structure and equivalent weight.
Dependencies are inferred from the claim text.