MITIGATION STRATEGIES FOR ENHANCED DURABILITY OF PFSA-BASED SHEET STYLE WATER VAPOR TRANSFER DEVICES
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Nov 18, 2016
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Nov 18, 2016
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A membrane humidifier assembly for fuel cell applications includes a first flow field plate adapted to facilitate flow of a first gas thereto, a second flow field plate adapted to facilitate flow of a second gas thereto, and a polymeric membrane disposed between the first flow field plate and second flow field plate. The polymeric membrane is adapted to permit transfer of water. In order to prevent a perfluorosulfonic acid polymer, humidifier membrane from fouling and having diminished water vapor transport performance, ammonia and cation contaminants must be removed from the ambient gas streams. Suitable cationic and ammonia scavengers include filters comprising polymers functionalized with carboxylic acid groups, phosphonic acid groups, sulfonic acid groups, perfluorosulfonic acid groups or combinations thereof.
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