Predicting Membrane Lifetime with Cerium Oxide in Heavy Duty Fuel Cell Systems

被引:15
|
作者
Macauley, Natalia [1 ]
Lauritzen, Michael [2 ]
Knights, Shanna [2 ]
Kjeang, Erik [1 ]
机构
[1] Simon Fraser Univ, Sch Mechatron Syst Engn, Surrey, BC V3T0A3, Canada
[2] Ballard Power Syst, Burnaby, BC V5J5J8, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
PROTON-EXCHANGE MEMBRANE; POLYMER ELECTROLYTE MEMBRANES; CATALYST COATED MEMBRANES; PERFLUOROSULFONATED ACID IONOMER; MECHANICAL-PROPERTIES; DEGRADATION MECHANISM; EXTERNAL HUMIDIFICATION; HYDROXYL RADICALS; DURABILITY; MITIGATION;
D O I
10.1149/2.0271810jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Stringent reliability and durability requirements for fuel cells in heavy duty vehicles demand highly durable ionomer membranes. Fuel cell membranes degrade chemically and mechanically during operation, which can lead to membrane thinning, pinhole and crack formation and eventual failure due to hydrogen leaks. The chemical portion of degradation can be suppressed with the use of radical scavenging agents such as cerium oxide. In order to implement extended durability solutions in actual field operation, however, aptly designed accelerated durability tests and empirical models are needed to predict membrane lifetime under various operating conditions, while also considering additive stability over time. Here, an empirical membrane lifetime model recently developed for transit bus applications is modified and demonstrated to predict membrane lifetime with cerium oxide incorporated into the membrane electrode assembly as a chemical stabilizer. The lifetime prediction approach utilizes laboratory scale experimental data from an accelerated membrane durability test complemented by measured cerium washout rates. Provided that the cerium washout rates were relatively low, the predicted membrane lifetime of cerium supported membranes was found to significantly exceed the ultimate 25,000 h heavy duty durability target. (C) The Author(s) 2018. Published by ECS.
引用
收藏
页码:F780 / F785
页数:6
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