Tunable High Performance Cross-Linked Alkaline Anion Exchange Membranes for Fuel Cell Applications
Tunable High Performance Cross-Linked Alkaline Anion Exchange Membranes for Fuel Cell Applications
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DOI：
10.1021/ja908638d
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发表时间：
2010-03-17
影响因子：
15
通讯作者：
Coates, Geoffrey W.
中科院分区：
文献类型：
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作者：
Robertson, Nicholas J.;Kostalik, Henry A.;Coates, Geoffrey W.
燃料电池是能量转换装置，在从汽车到便携式电子产品的许多应用中显示出巨大的潜力。然而，燃料电池组件的进一步发展是必要的，使它们成为商业上可行的。对它们的性能至关重要的一个组件是聚合物电解质膜，其是分隔两个电极的离子传导介质。虽然质子传导膜已经很好地建立（例如，相比之下，氢氧化物传导膜（碱性阴离子交换膜，AAEM）相对未被探索。在碱性条件下运行提供了显著的效率优势，特别是对于氧还原反应;因此，有效的AAEM可以显著推进燃料电池技术。在这里，我们展示了使用开环易位聚合，以产生新的交联膜材料，表现出高的氢氧离子电导率和良好的机械性能。交联允许增加的离子掺入，这又支持高电导率。这种简便的合成方法使交联材料的制备具有满足氢动力燃料电池以及直接甲醇燃料电池需求的潜力。
Fuel cells are energy conversion devices that show great potential in numerous applications ranging from automobiles to portable electronics. However, further development of fuel cell components is necessary for them to become commercially viable. One component critical to their performance is the polymer electrolyte membrane, which is an ion conductive medium separating the two electrodes. While proton conducting membranes are well established (e.g., Nafion), hydroxide conducting membranes (alkaline anion exchange membranes, AAEMs) have been relatively unexplored by comparison. Operating under alkaline conditions offers significant efficiency benefits, especially for the oxygen reduction reaction; therefore, effective AAEMs could significantly advance fuel cell technologies. Here we demonstrate the use of ring-opening metathesis polymerization to generate new cross-linked membrane materials exhibiting high hydroxide ion conductivity and good mechanical properties. Cross-linking allows for increased ion incorporation, which, in turn supports high conductivities. This facile synthetic approach enables the preparation of cross-linked materials with the potential to meet the demands of hydrogen-powered fuel cells as well as direct methanol fuel cells.