Selective coatings for PEM fuel cell electrode contacts

Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation

Reexamination Certificate

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C429S006000, C429S006000

Reexamination Certificate

active

06878478

ABSTRACT:
A bipolar plate for use in a fuel cell assembly having channels for conveying oxygen and fuel along the cathode and anode surfaces of adjacent fuel cell units. The channels are separated by lands for making electrical and mechanical contact with the respective cathode and anode surfaces and preferably are so configured as to provide the minimum area required for satisfactory electrical contact and mechanical support. The lands and channels preferably are formed as peaks and valleys or as raised or recessed dimples for making electrical/mechanical contact with the cathode and anode surfaces and are coated in those contact areas with corrosion-resistant metal such as gold, platinum, ruthenium, or combinations thereof.

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