| US 7,381,240 B2 | ||
| Platinum particles with varying morphology | ||
| Michael K. Carpenter, Troy, Mich. (US); and Ion C. Halalay, Grosse Pointe, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Nov. 16, 2006, as Appl. No. 11/560,471. | ||
| Claims priority of provisional application 60/739741, filed on Nov. 23, 2005. | ||
| Prior Publication US 2007/0113704 A1, May 24, 2007 | ||
| Int. Cl. B22F 9/20 (2006.01); B22F 9/24 (2006.01); B22F 9/02 (2006.01); B01J 37/34 (2006.01); C22C 5/04 (2006.01); B01J 13/00 (2006.01) | ||
| U.S. Cl. 75—345 [148/430; 204/157.15; 204/157.42; 502/104; 977/777; 977/948] | 12 Claims |
| 1. A method of making platinum particles, the method comprising:
suspending or dissolving at least one precursor compound of platinum at a predetermined concentration level in a liquid medium
of water, a water and alcohol mixture, or a hydrocarbon selected from the group consisting of decane, dodecane, tridecane,
decalin, and tetralin;
heating the liquid to a temperature of about 60° C.;
bubbling a reducing gas consisting essentially of hydrogen gas through the liquid medium; and
subjecting the liquid medium to ultrasonic vibrations at a predetermined power level to reduce the precursor(s) to micrometer
size, spherical platinum particles with surfaces containing spike-like protuberances.
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