Fuel cell performance recovery by cyclic oxidant starvation

Details Fuel cell performance recovery by cyclic oxidant starvation Fuel cell performance recovery by cyclic oxidant starvation

2005-01-11

2005-01-11

Yuan, Dah-Wei (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S010000, C429S010000

Reexamination Certificate

active

06841278

ABSTRACT:
Performance of a fuel cell stack (12) is recovered following long term decay by connecting (51) an auxiliary load (50) to the fuel cell while shutting off one or more of oxidant inlet valve (27a), oxidant pressure regulating valve (28a) or oxidant pump (26), which all may be achieved with a controller (46), to cyclically starve the cathode of oxidant so that it achieves hydrogen potential, e.g., less than 0.1 volts, for on the order of tens of seconds, repetitively, such as at every 10 or 20 seconds, while the auxiliary load remains connected, initially drawing 10 to 100 mASC, for example. Complete rejuvenation is obtained following 1800 or more cycles over a period of five or more hours.

REFERENCES:
patent: 6096448 (2000-08-01), Wilkinson et al.
patent: 6472090 (2002-10-01), Colbow et al.

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