SYSTEM AND METHOD FOR OPERATING A HIGH TEMPERATURE FUEL CELL AS A BACK-UP POWER SUPPLY WITH REDUCED PERFORMANCE DECAY
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United States of America Patent
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Jun 19, 2012
Grant Date -
Jun 21, 2012
app pub date -
Feb 7, 2012
filing date -
Nov 19, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method is provided for reducing degradation in a fuel cell assembly, including at least one fuel cell with a PBI membrane, during standby, operation. The method may include electrochemically consuming an oxidant from a cathode coupled to the PBI membrane in response to a disconnection of an external load and supplying fuel to remove or electrochemically consume any back-diffused oxidant to the associated fuel cell sufficient to replace or consume the back-diffused oxidant while the external load is removed, and/or also may include controlling a standby temperature of the fuel cell. In this way, it may be possible to avoid increased cell voltage decay associated with degradation of the PBI in a simple and cost effective system.
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