Impacts of Organic Sorbates on the Ionic Conductivity and Nanostructure of Perfluorinated Sulfonic-Acid Ionomers
Impacts of Organic Sorbates on the Ionic Conductivity and Nanostructure of Perfluorinated Sulfonic-Acid Ionomers
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DOI：
10.1021/acs.macromol.1c00494
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发表时间：
2021-05
期刊：
影响因子：
5.5
通讯作者：
Adlai Katzenberg;Andrea Angulo;A. Kusoglu;M. Modestino
中科院分区：
文献类型：
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作者：
Adlai Katzenberg;Andrea Angulo;A. Kusoglu;M. Modestino
这项研究提供了深入了解与有机山梨酸盐溶胀的Nafion膜的结构-性能关系，揭示了山梨酸盐极性，离聚物结构域结构和离子电导率之间的相关性。用红外光谱、X射线散射和伏安法研究了Nafion在短链醇和烷烃存在下的溶胀、纳米结构和离子导电性。与烷烃平衡的Nafion表现出可忽略不计的吸收和纳米溶胀，而醇类诱导的纳米-宏观-溶胀比随醇类极性增加。在包括有机物和水的混合山梨酸盐环境中，醇保留了整体离聚物结构域结构，但改变了基质以实现更高的山梨酸盐吸收。烷烃没有明显改变水合纳米结构或导电性。确定有机山梨酸酯对Nafion等离聚物的结构-性能关系的影响是必要的，因为基于膜的电化学设备在从有机燃料电池到燃料和化学品合成的新兴领域中找到了应用。
This study provides insights into structure-property relationships of Nafion membranes swollen with organic sorbates, revealing correlations between sorbate polarity, ionomer domain structure, and ionic conductivity. Swelling, nanostructure, and ionic conductivity of Nafion in the presence of short-chain alcohols and alkanes was studied by infrared spectroscopy, X-ray scattering, and voltammetry. Nafion equilibrated with alkanes exhibited negligible uptake and nanoswelling, while alcohols induced nanoscopic- to macroscopic- swelling ratios that increased with alcohol polarity. In mixed-sorbate environments including organics and water, alcohols preserved the overall ionomer domain structure but altered the matrix to enable higher sorbate uptake. Alkanes did not demonstrably alter the hydrated nanostructure or conductivity. Identifying the impacts of organic sorbates on structure-property relationships in ionomers such as Nafion is imperative as membrane-based electrochemical devices find applications in emerging areas ranging from organic fuel cells to the synthesis of fuels and chemicals.