Mitigating fuel cell start up/shut down degradation

Details Mitigating fuel cell start up/shut down degradation Mitigating fuel cell start up/shut down degradation

2011-02-15

2011-02-15

Yuan, Dah-Wei D (Department: 1727)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

C429S428000, C429S434000, C429S439000

Reexamination Certificate

active

07887963

ABSTRACT:
A method of operating an electrochemical conversion assembly is provided where a shut down sequence is introduced where a substantially dry gas is driven through the cathode flow field. The dry gas is supplied for an amount of time sufficient to reduce the water content of the proton exchange membrane to a level sufficient to suppress corrosion and catalyst dissolution in the membrane electrode assembly. Additional embodiments are disclosed.

REFERENCES:
patent: 4537839 (1985-08-01), Cameron
patent: 2001/0028967 (2001-10-01), Roberts et al.
patent: 2003/0186093 (2003-10-01), St-Pierre et al.
patent: 2004/0033398 (2004-02-01), Kearl et al.
patent: 2005/0031922 (2005-02-01), Clingerman et al.
International Search Report dated Aug. 1, 2007 for Appln No. PCT/US06/11736 filed Mar. 31, 2006 corresponding to this application.

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