Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature
Patent
1998-12-10
2000-05-30
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Having magnetic field feature
429 25, H01M 804
Patent
active
060689420
ABSTRACT:
A process for operating a PEM fuel cell installation includes providing at least one PEM fuel cell module having an inlet valve for hydrogen H.sub.2 and an inlet valve for oxygen O.sub.2. In order to switch off the PEM fuel cell module, the oxygen O.sub.2 inlet valve is closed in a first step, and the hydrogen H.sub.2 inlet valve is closed in a second step when a predetermined oxygen O.sub.2 partial pressure at a cathode part of the PEM fuel cell module is reached. Reliable operation of the PEM fuel cell installation is guaranteed by this measure.
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Bette Willi
Hornung Regina
Strasser Karl
Greenberg Laurence A.
Kalafut Stephen
Lerner Herbert L.
Siemens Aktiengesellschaft
Stemer Werner H.
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