Application of an ionomer layer to a substrate and products...

Details Application of an ionomer layer to a substrate and products... Application of an ionomer layer to a substrate and products...

2005-03-15

2005-03-15

Bell, Mark L. (Department: 1755)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Making catalytic electrode, process only

C427S115000, C427S243000, C427S244000, C427S356000, C427S372200

Reexamination Certificate

active

06867159

ABSTRACT:
A disclosed method for coating a substrate with an ionomer, applies the ionomer as a component of a stable foam, then dries the applied foam layer. The substrate to be so coated, in particular embodiments, is an electrode substrate, with or without a catalyst layer applied thereon. In another embodiment, the substrate is an ion-exchange membrane. In yet more particular embodiments, the substrate is suitable for use in an electrochemical fuel cell. Also disclosed are products made by the disclosed methods, namely, ionomer-coated substrates, including ionomer-coated electrode substrates and electrodes. The foam layer may also comprise catalyst powder to form a catalyst layer. Membrane electrode assemblies, fuel cells, and fuel cell stacks that incorporate the substrates are also disclosed, as are motor vehicles, and stationary and portable electrical power-generating plants that incorporate the fuel cell stacks.

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