Composite membranes to reduce crossover in PEM fuel cells

G. A. Deluga, S. C. Kelley, B. Pivovar, D. A. Shores, W. Smyrl
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引用次数: 5

Abstract

Nafion has long been the standard polymer for use in polymer electrolyte membrane (PEM) fuel cells. The main purpose for the electrolyte is to allow protons to pass through freely while being a barrier to electrons and reactants. Nafion fails as a barrier to methanol solutions, and thus much research has been carried out to find a replacement for Nafion in liquid feed direct methanol fuel cells. In the present work, the authors present a method to modify both polybenzimidazole (PBI) and Nafion to make an improved methanol barrier while maintaining suitable proton conductivity. PBI was chemically modified, by sulfonation, ((s)-PBI) to make it an intrinsic proton conductor and deposited as an additional layer on a Nafion membrane. The addition of (s)-PBI to Nafion creates a composite polymer electrolyte that is a reasonable proton conductor while reducing the crossover of methanol.
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减少PEM燃料电池交叉的复合膜
长期以来,Nafion一直是聚合物电解质膜(PEM)燃料电池的标准聚合物。电解质的主要目的是允许质子自由通过,同时成为电子和反应物的屏障。Nafion作为甲醇溶液的屏障失败了,因此已经进行了大量的研究来寻找液体进料直接甲醇燃料电池中Nafion的替代品。在本工作中,作者提出了一种方法来修饰聚苯并咪唑(PBI)和Nafion,以改善甲醇屏障,同时保持合适的质子电导率。通过磺化对PBI进行化学修饰(s)-PBI),使其成为固有的质子导体,并作为附加层沉积在Nafion膜上。在Nafion中添加(s)-PBI,可以形成一种复合聚合物电解质,它是一种合理的质子导体,同时减少了甲醇的交叉。
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