Method of manufacture employing electrochemically dispersed platinum catalysts deposited on a substrate
US4490219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1982 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Oct 7, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S204/09
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A substrate such as carbon, graphite, or various semiconductors is coated with a "two-dimensional" thin film form of flat isolated crystallites of platinum, palladium or silver to form a catalyst useful in a fuel cell. The method of formation of the catalyst is to place the substrate in an electrolyte such as H.sub.2 PtCl.sub.6 about 1% and one molar sulfuric acid. The potentiostatic pulse plating method is employed. A high potential pulse of very short duration is followed by a low potential of substantial duration. The very high potential nucleates crystals at various randomly distributed nucleation sites such as imperfections in the surface of the substrate. The resulting catalyst has a large surface area of hexagonal crystals about 20 to 40 Angstroms in diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.