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首页> 外文期刊>Advanced Functional Materials >Anion Exchange lonomers: Impact of Chemistry on Thin-Film Properties
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Anion Exchange lonomers: Impact of Chemistry on Thin-Film Properties

机译：阴离子交换液体：化学对薄膜特性的影响

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摘要

Ionomer thin-films (i.e., 20-100 nm) on supports serve as model systems to understand ionomer-catalyst interfacial behavior as well as the confinement-driven deviation in properties from bulk membranes. While ionomer thin-films have been examined for proton exchange ionomers, the thin-film properties of anion exchange ionomers (AEIs) remain largely unexplored. More importantly, delineating the convoluted impact of chemistry and confinement on thin-film morphology and hydration is of interest to advancing the field on functional ionic interfaces. In this work, these aspects are studied by using AEIs of different backbones (perfluorinated, aliphatic, and aromatic) and side chains (various lengths, and single versus dual functional groups). Quartz-crystal microbalance and spectroscopic ellipsometry are used to analyze density and coupled with calculated free volume fraction of thin-films to provide insights on their gas transport properties. AEI side-chain's chemical character plays a key role in how confinement modulates hydration (in thin-film versus bulk). The results elucidate the effects of backbone, side-chain chemistry versus anion/cation type in the confinement-driven changes in thin-film morphology and swelling. This study also provides new insights for tuning AEI transport functionalities at interfaces via chemistry, which can benefit the design and development of electrode-ionomers for alkaline membrane-based energy systems.
机译：离聚物薄膜（即20-100nm）的载体上用作理解离聚物 - 催化剂界面行为的模型系统，以及来自块状膜的性质的限制驱动偏差。虽然已经检查了离聚物薄膜的质子交换离聚物，但阴离子交换离聚物（AEIS）的薄膜性能仍然很大程度上是未探斗的。更重要的是，描绘化学和禁闭对薄膜形态和水合的互相影响是有意义的，推进功能性离子界面。在这项工作中，通过使用不同骨架（全氟化，脂族和芳族）和侧链（各种长度和单一与双官能团）的AEIS研究这些方面。石英晶微观和光谱椭圆形测定法用于分析密度并与替代的自由体积分数相结合，以提供对其气体运输性质的见解。 AEI侧链的化学品特征在禁闭如何调节水合（薄膜与散装中）起关键作用。结果阐明了骨干，侧链化学与阴离子/阳离子类型在薄膜形态和肿胀中的限制驱动变化中的影响。本研究还提供了通过化学在界面调整AEI运输功能的新见解，这可以有利于碱性膜的能量系统的电极离聚物的设计和开发。

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