Water management of PEM fuel cell stacks using surface active agents
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United States of America Patent
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Apr 30, 2013
Grant Date -
May 24, 2007
app pub date -
Nov 23, 2005
filing date -
Nov 23, 2005
priority date (Note) -
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Abstract
A fuel cell system that employs a surface active agent that reduces the surface tension of the water in the flow field channels. The fuel cell system includes humidifiers that humidify the cathode inlet airflow and the hydrogen anode gas. The surface active agent is mixed with the humidifying water in the humidifiers so that the surface active agent enters the flow field channels to reduce the surface tension of the water therein, thus allowing the water to wick the channels. In one non-limiting embodiment, the surface active agent is ethanol. Ruthenium can be added to the platinum in the catalyst layers of the fuel cells to mitigate the poisoning of platinum by carbon monoxide, which is one of the oxidation products of ethanol on the cathode side of the fuel cell.
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