Method of manufacture employing electrochemically dispersed platinum catalysts deposited on a substrate
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United States of America Patent
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Dec 25, 1984
Grant Date -
N/A
app pub date -
Oct 7, 1982
filing date -
Oct 7, 1982
priority date (Note) -
Expired
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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.
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