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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Constructing efficient ion nanochannels in alkaline anion exchange membranes by the in situ assembly of a poly(ionic liquid) in metal-organic frameworks
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Constructing efficient ion nanochannels in alkaline anion exchange membranes by the in situ assembly of a poly(ionic liquid) in metal-organic frameworks

机译：通过在金属有机骨架中原位组装聚离子液体在碱性阴离子交换膜中构建有效的离子纳米通道

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Alkaline anion exchange membranes (AEMs) have triggered great interest in the energy field because they permit the use of non-precious metal catalysts in fuel cells. It is of great significance to fabricate highly conductive AEMs by intensifying the ion transport within membranes through constructing ion nanochannels that provide efficient hydroxide ion transport. In this study, we propose a new approach to construct well-organized ion nanochannels by the in situ assembly of a poly(ionic liquid) (PIL) as the ion carrier within the highly ordered pores of metal-organic frameworks (MOFs). The MOF membrane, prepared by a facile hot-press method, exhibited a high conductivity of 36.6 mS cm(-1) at a low ion concentration of 0.633 mmol cm(-3) (20 degrees C), which is 6 orders of magnitude higher than that of the MIL-101 containing no poly(ionic liquid). Accordingly, the transport behavior of hydroxide ions was exploited, providing MOF membranes showing a high effective mobility of up to 6.597 x 10(-4) cm(2) s V-1 and a high transport hydroxide ion efficiency of up to 36.64% at 20 degrees C. The results imply that the efficiency of OH- conduction in the PIL confined MOF is 113% higher than that of the H+ conduction in Nafion.
机译：碱性阴离子交换膜（AEM）在能源领域引起了极大的兴趣，因为它们允许在燃料电池中使用非贵金属催化剂。通过构建可提供有效氢氧根离子传输的离子纳米通道来增强膜内的离子传输，从而制造出高导电性的AEM至关重要。在这项研究中，我们提出了一种通过在金属有机骨架（MOFs）的有序孔中原位组装聚离子液体（PIL）作为离子载体的结构良好的离子纳米通道的新方法。通过方便的热压方法制备的MOF膜在0.633 mmol cm（-3）（20摄氏度）的低离子浓度下（6个数量级）表现出36.6 mS cm（-1）的高电导率高于不含聚离子液体的MIL-101。因此，利用了氢氧根离子的传输行为，提供了在高达6.597 x 10（-4）cm（2）s V-1的条件下显示出高有效迁移率且在氢氧根下高达36.64％的高传输氢氧根离子效率的MOF膜。 20摄氏度。结果表明，在PIL受限的MOF中，OH-传导效率比Nafion中的H +传导效率高113％。

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