Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1997-10-24
2000-05-16
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 23, 429 12, 429 17, 429 90, H01M 806
Patent
active
060635169
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. The PEM-probe is intermittently purged of any CO build-up on the anode catalyst (e.g., by (1) flushing the anode with air, (2) short circuiting the PEM-probe, or (3) reverse biasing the PEM-probe) to keep the PEM-probe at peak performance levels.
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XP002093321 Derwent Publication.
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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