Separator for low-temperature type fuel cell and production...

Details Separator for low-temperature type fuel cell and production... Separator for low-temperature type fuel cell and production...

2001-09-07

2009-10-27

Ryan, Patrick (Department: 1795)

Metal working

Method of mechanical manufacture

Electrical device making

Reexamination Certificate

active

07608119

ABSTRACT:
A stainless steel sheet useful as a separator for a low-temperature fuel cell has the surface state that a lot of fine projections (p) stand close together around many fine pits (d) formed over a whole surface. The surface state is realized by alternating electrolytic etching in a ferric chloride solution. When the stainless steel separator is built in a fuel cell, contact resistance between the separator and a graphite electrode is kept at a lower level even in a corrosive atmosphere. Consequently, the fuel cell can be driven with high power-generating efficiency over a long term even under severely corrosive conditions without generation of massive Joule heat.

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Englebert, Dan, “Passivation of Stainless Steel”, PF Online (pfonline.com/articles/119806.html). See paragraphs 1-3.

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