Chemistry: electrical current producing apparatus – product – and – Having earth feature
Reexamination Certificate
2008-07-15
2008-07-15
Kopec, Mark (Department: 1796)
Chemistry: electrical current producing apparatus, product, and
Having earth feature
C252S511000, C428S304400
Reexamination Certificate
active
11112148
ABSTRACT:
Ink dispersions for use in fuel cells, comprising a mixture of: (1) a carbon-containing material, such as carbon black; and (2) a base or acid operable to adjust the pH of the ink dispersion, wherein the pH of the mixture has a zeta potential as close to lying outside the +/−30 mV range of the point of zero charge. The mixtures can also include a fluoropolymer, at least one alcohol, and water. The ink dispersions can be used in conjunction with the gas diffusion media components of the fuel cell, including proton exchange membrane fuel cells. The ink dispersions are very stable and can be used in conjunction with high current density applications.
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GM Global Technology Operations Inc.
Kopec Mark
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