Active layer for membrane electrode assembly
AssigneeThe Dow ChemicalCompany
InventorsRobert D. Mussell, Timothy J. Rehg
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Abstract
Described is a membrane electrode assembly having an ion exchange membrane, and at least two active layers positioned on the same side of the membrane; wherein the active layers containing catalytically-active particles and an ionomer; the average equivalent weights of the ionomers in the layers differ by at least 50; and the active layer positioned closest to the membrane contains the ionomer with the lower average equivalent weight. This membrane electrode assembly, when utilized in a fuel cell, provides a relatively high voltage at a given current density and gas flow rate.
Claims25
A membrane electrode assembly having an ion exchange membrane, and at least two active layers positioned on the same side of the membrane;
- wherein the active layers comprise catalytically-active particles and an ionomer;
- the average equivalent weights of the ionomers in the layers differ by at least 50;
- and the active layer positioned closest to the membrane contains the ionomer with the lower average equivalent weight.
A membrane electrode assembly having an ion exchange membrane, and at least one active layer positioned on one side of the membrane;
- wherein the active layers comprises (a) catalytically-active particles, and (b) an ionomer having an equivalent weight of at least 650 and less than 950 and which is substantially insoluble in water at a temperature of less than 100.degree. C.
A composition comprising (a) catalytically-active particles, (b) an organic compound, and (c) an ionomer having an equivalent weight of at least 650 and less than 950 and which, after removal of component (b) from the composition, is substantially insoluble in water at a temperature of less than 100.degree. C.
Dependencies are inferred from the claim text.