Method for operating fuel cells on impure fuels
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United States of America Patent
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Dec 31, 2002
Grant Date -
Oct 11, 2001
app pub date -
Jan 29, 2001
filing date -
Jul 2, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The electrocatalysts in certain fuel cell systems can be poisoned by impurities in the fuel stream directed to the fuel cell anodes. Introducing a variable concentration of oxygen into the impure fuel stream supplied to the fuel cells can reduce or prevent poisoning without excessive use of oxygen. The variation may be controlled based on the voltage of a carbon monoxide sensitive sensor cell incorporated in the system. Further, the variation in oxygen concentration may be periodic or pulsed. A variable air bleed method is particularly suitable for use in solid polymer fuel cell systems operating on fuel streams containing carbon monoxide.
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