含有由阳离子-偶极相互作用构建的窄跨度通道的高导电聚（亚芳基-咪唑）阴离子交换膜,ACS Applied Polymer Materials

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含有由阳离子-偶极相互作用构建的窄跨度通道的高导电聚（亚芳基-咪唑）阴离子交换膜
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-02-14 , DOI: 10.1021/acsapm.2c02029
Hatam Najafi Fath Dehghan ₁ , Amir Abdolmaleki ₁ , Mohammad Zhiani ₂

Affiliation

基于膜的碱性电解槽和燃料电池系统有一个明显的缺点，因为它使用浓缩的、腐蚀性的碱性电解质。阴离子交换膜 (AEM) 的电导率也低于质子交换膜 (PEM)，因为 OH ^–离子具有较低的渗透系数。在这项研究中，为了在低浓度碱性溶液中制备具有高离子电导率的 AEM，合成了两种咪唑二醇单体作为合成稳定阴离子交换聚合物的独特候选物。然后报道了一种利用咪唑阳离子和极性聚（乙烯基吡咯烷酮）（PVP）（PAIm1/PVP 混合膜和 Cross-PAIm1-PVP 膜）之间的强阳离子-偶极相互作用设计具有离子传导通道的 AEM 的策略。在 25 °C 时，PAIm1/PVP 混合物和 Cross-PAIm1-PVP 膜在水中的离子电导率分别为 77.1、104.9 mS cm –1 ^（ Cl ^–形式）和 315、356.1 mS cm ^–1分别在 KOH 0.2 M 中。此外，还合成了一种半结晶聚亚芳基咪唑鎓 2 (PAIm2)，并将其与 PVP 混合以增加离子的取向，从而提高离子电导率。25 °C 时，PAIm2/PVP 混合膜的离子电导率在水中（Cl ^-形式）为 25.9 mS cm ^–1 ，在 KOH 0.2 M 中为86.1 mS cm ^{–1 。}此外，在直接乙醇燃料电池 (DEFC) 中制备的膜在单电池性能方面表现出较好的行为， PAIm1/PVP 在 30 °C 时的峰值功率密度 (Pmax) 分别为 17.7、11.1 和 9.1 mW cm ^–2、PAIm2/PVP 和 Cross-PAIm1-PVP 膜。结果表明，所制备的 AEMs 可用于电解槽和燃料电池。

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Highly Conducting Poly(arylene-imidazolium) Anion Exchange Membranes Containing Thin-Span Channels Constructed by Cation–Dipole Interaction

The membrane-based alkaline electrolyzer and fuel cell system has a significant drawback because it uses a concentrated, corrosive alkaline electrolyte. The anion exchange membranes (AEMs) also have lower conductivity than proton exchange membranes (PEMs) because OH^– ions have a lower penetration coefficient. In this study, intending to prepare AEMs with high ionic conductivity in low concentrations of alkaline solution, two imidazolium diol monomers have been synthesized as unique candidates for the synthesis of stable anion exchange polymers. Then a strategy for designing AEMs with ion-conducting channels using a strong cation-dipole interaction between imidazolium cations and polar poly(vinylpyrrolidone) (PVP) (PAIm1/PVP blend membrane and Cross-PAIm1-PVP membrane) was reported. At 25 °C, the PAIm1/PVP blend and Cross-PAIm1-PVP membrane have ionic conductivities of 77.1, 104.9 mS cm^–1 in water (Cl^– form), and 315, 356.1 mS cm^–1 in KOH 0.2 M, respectively. Also, a semicrystalline poly(arylene-imidazolium)2 (PAIm2) was synthesized and blended with PVP to increase the ions’ orientation for boosted ion conductivity. The ionic conductivity of the PAIm2/PVP blend membrane is 25.9 mS cm^–1 in water (Cl^– form) and 86.1 mS cm^–1 in KOH 0.2 M at 25 °C. In addition, the prepared membranes in direct ethanol fuel cells (DEFCs) show preferable behavior in single-cell performance, with a peak power density (Pmax) of 17.7, 11.1, and 9.1 mW cm^–2 at 30 °C for PAIm1/PVP, PAIm2/PVP, and Cross-PAIm1-PVP membranes, respectively. The results demonstrate that the prepared AEMs can use in electrolyzers and fuel cells.

更新日期：2023-02-14

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