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US 10,381,653 B2Granted
PEMFC electrode mudcrack mitigation at low Pt loading
AssigneeGM Global Technology Operations LLC
InventorsRoland J. Koestner, Swaminatha P. Kumaraguru, Irina A. Kozhinova
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Abstract
An electrode ink composition that forms a fuel cell catalyst layer with reduced mudcracking is provided. The ink composition includes a solvent, a platinum group metal-containing catalyst composition dispersed in the solvent, a primary polymer dispersed within the solvent, the primary polymer being an ionomer, and a secondary polymer dispersed within the solvent, the secondary polymer interacting with the primary polymer via a non-covalent interaction.
Claims10
An electrode ink composition comprising:
- a solvent;
- a platinum group metal-containing catalyst composition dispersed in the solvent;
- a primary polymer dispersed within the solvent, the primary polymer being an ionomer;
- and
- a secondary polymer dispersed within the solvent, the secondary polymer interacting with the primary polymer via ionic bonding;
- wherein the primary polymer is described by formulae I or II:
- in which n is 1 to 10;
- m is 1, 2, or 3;
- o is 30 to 800;
- and p is 1, 2, or 3;
- wherein the secondary polymer is a high molecular-weight polyvinyl-2-pyrrolidone having a weight average molecular weight greater than or equal to 400 kDa, and wherein the primary polymer and the secondary polymer are each independently present in an amount ranging from 1 weight percent to 20 weight percent based on a total weight of the electrode ink composition.
8 more elements
A fuel cell comprising:
- an anode catalyst layer;
- a cathode catalyst layer;
- an ion conducting membrane interposed between anode catalyst layer and cathode catalyst layer;
- a first gas diffusion layer is disposed over anode catalyst layer;
- a second gas diffusion layer is disposed over the cathode catalyst layer;
- an anode flow field plate is disposed over the first gas diffusion layer;
- and
- a cathode flow field plate is disposed over the second gas diffusion layer, wherein at least one of the anode catalyst layer or the cathode catalyst layer include a platinum group metal-containing catalyst composition, a primary polymer that is an ionomer, and a secondary polymer, the secondary polymer interacting with the primary polymer via a non-covalent interaction when the primary polymer and the secondary polymer are dispersed in a solvent;
- wherein the primary polymer is described by formulae I or II:
- in which n is 1 to 10;
- m is 1, 2, or 3;
- o is 30 to 800;
- and p is 1, 2, or 3;
- and wherein the secondary polymer has an overlap concentration that is from 5 to 20 times lower than an overlap concentration of the primary polymer.
11 more elements
Dependencies are inferred from the claim text.