Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1997-10-24
1999-12-14
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 23, 481277, H01M 804
Patent
active
060014997
ABSTRACT:
The CO concentration in the H.sub.2 feed stream to a PEM fuel cell stack is monitored by measuring current and/or voltage behavior patterns from a PEM-probe communicating with the reformate feed stream. Pattern recognition software may be used to compare the current and voltage patterns from the PEM-probe to current and voltage telltale outputs determined from a reference cell similar to the PEM-probe and operated under controlled conditions over a wide range of CO concentrations in the H.sub.2 fuel stream. A CO sensor includes the PEM-probe, an electrical discharge circuit for discharging the PEM-probe to monitor the CO concentration, and an electrical purging circuit to intermittently raise the anode potential of the PEM-probe's anode to at least about 0.8 V (RHE) to electrochemically oxidize any CO adsorbed on the probe's anode catalyst.
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patent: 4910099 (1990-03-01), Gottesfeld
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patent: 5843195 (1998-12-01), Aoyama
Borup Rodney Lynn
Grot Stephen Andreas
Gutowski Stanley
Meltser Mark Alexander
Neutzler Jay Kevin
General Motors Corporation
Martin Angela J.
Nuzzolillo Maria
Plant Lawrence B.
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