Membrane electrode assembly comprising a catalyst migration barrier layer
AssigneesFord Motor Company, Daimler AG
InventorsDmitri Bessarabov, Sumit Kundu, Stephen Lee, Scott McDermid
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Abstract
A membrane electrode assembly for a fuel cell is disclosed, which comprises at least one porous ionomer containing layer disposed at the interface between the cathode electrocatalyst material and the ion exchange membrane of the fuel cell. The porous ionomer containing layer comprises a catalyst migration impeding compound. The membrane electrode assembly exhibits improved stability against Pt dissolution and Pt-band formation within the ion exchange membrane, hence having improved durability and lifetime performance.
Claims12
A membrane electrode assembly for a fuel cell, said membrane electrode assembly comprising
- (a) a porous anode gas diffusion layer;
- (b) a porous cathode gas diffusion layer;
- (c) an ion exchange membrane interposed between said porous anode gas diffusion layer and said porous cathode gas diffusion layer;
- (d) an anode electrocatalyst material disposed at the interface between said porous anode gas diffusion layer and said ion exchange membrane;
- (c) a cathode electrocatalyst material disposed on the surface of said porous cathode catalyst layer;
- (d) at least one porous ionomer containing layer disposed at the interface between said cathode electrocatalyst material and said ion exchange membrane;
- wherein said porous ionomer containing layer comprises a catalyst migration impeding compound.
Dependencies are inferred from the claim text.