| US 7,550,223 B2 | ||
| Method of making metal-polymer composite catalysts | ||
| Piotr Zelenay, Los Alamos, N. Mex. (US); and Rajesh Bashyam, Los Alamos, N. Mex. (US) | ||
| Assigned to Los Alamos National Security, LLC, Los Alamos, N. Mex. (US) | ||
| Filed on Oct. 02, 2006, as Appl. No. 11/542,539. | ||
| Claims priority of provisional application 60/724552, filed on Oct. 06, 2005. | ||
| Prior Publication US 2007/0082804 A1, Apr. 12, 2007 | ||
| Int. Cl. H01M 4/00 (2006.01); H01M 8/10 (2006.01); H01M 4/88 (2006.01); B01J 31/00 (2006.01); B01J 23/00 (2006.01) | ||
| U.S. Cl. 429—43 [429/30; 502/101; 502/152; 502/182; 502/185] | 20 Claims |
| 1. A method of making a cathode catalyst, wherein the cathode catalyst comprises a composite comprising a heteroatomic polymer
and dispersed carbon particles, a transition metal other than platinum linked to the heteroatomic polymer by one of nitrogen,
sulfur, phosphorus, and oxygen, and a recast ionomer dispersed throughout the heteroatomic polymer-carbon composite, the method
comprising the steps of:
a. forming the composite comprising a heteroatomic polymer and dispersed carbon particles;
b. loading the transition metal on the composite comprising a heteroatomic polymer and dispersed carbon particles to form
a transition metal composite by:
i. forming an aqueous dispersion of the composite comprising a heteroatomic polymer and dispersed carbon particles;
ii. providing a precursor of the transition metal to the aqueous dispersion; and
iii. reducing the transition metal prior to forming the transition metal composite by adding a reducing agent to the aqueous
dispersion; and
c. blending the recast ionomer with the transition metal composite to form the cathode catalyst.
|