Separator for fuel cell, fuel cell incorporating the same,...

Details Separator for fuel cell, fuel cell incorporating the same,... Separator for fuel cell, fuel cell incorporating the same,...

H - Electricity

01

M

H01M 2/14 (2006.01) C23C 28/00 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2270860

An inexpensive and corrosion resistant metal-made gas separator includes a base formed by joining formed stainless steel base sheets face to face. The base carries on each of opposite surfaces thereof a first coating layer formed by plating with tin. The base is also coated with a second coating layer of a thermal expansion graphite. When incorporated into a fuel cell, the separator contacts gas diffusion electrodes that are formed from a carbon material similar to the carbon material of the second coating layer, so that the contact resistance is reduced. The first coating layer is formed after a passive state coating is removed from the stainless steel surface, so that an increase in the internal resistance of the separator caused by the passive state coating is substantially prevented.

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