Engineering of Interconnected Ionic Channels in Polybenzimidazole Anion-Exchange Membranes,Industrial & Engineering Chemistry Research

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Engineering of Interconnected Ionic Channels in Polybenzimidazole Anion-Exchange Membranes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-10-09 , DOI: 10.1021/acs.iecr.3c02220
Ruizhen Yang ₁ , Xuemei Wu ₁ , Wanting Chen ₁ , Xiaozhou Wang ₁ , Tiantian Li ₁ , Xiaoming Yan ₁ , Leilei Wang ₁ , Fujun Cui ₂ , Gaohong He _{1,

2}

Affiliation

To balance the ion conduction and stability of anion-exchange membranes (AEMs), the efficiency of OH^– transfer needs to be improved. Here a series of polybenzimidazole-based AEMs (UTA-PBI-x) with comb-shaped tricationic side chains containing two diethoxy spacers and one alkyl spacer were synthesized. It is found that in the low-IEC region, hydrogen-bond network is the dominant contribution to ion transport, while the hydrated ionic channels would gradually become more dominant with increasing ionic content. With an optimal IEC of 1.40 mmol/g, OH^– ions could rapidly transfer in the desired hydrated cationic clusters and through the thin intercluster ether-containing hydrogen-bond network domains. Meanwhile, the ether domains guarantee a continuous nonionic phase for resisting water swelling. Consequently, the UTA-PBI-1.40 membrane simultaneously possesses a low swelling ratio of 17.2%, sufficient conductivity of 46.9 mS/cm at 20 °C, excellent mechanical strength (21.1 MPa), and good alkaline stability (∼90% remaining conductivity) in 1 M NaOH for ∼1400 h. A high efficiency of OH^– transport (σ/IEC ∼ 103.2) was achieved, which is superior to those of the recently reported AEMs. In a H₂/O₂ fuel cell, the ultrathin UTA-PBI-1.40 membrane achieves a peak power density of 861.6 mW/cm² at 80 °C. This work provides a theoretical and experimental guidance for the design of AEMs with high-efficient OH^– transfer.

中文翻译：

聚苯并咪唑阴离子交换膜中互连离子通道的工程

为了平衡阴离子交换膜 (AEM) 的离子传导和稳定性，需要提高 OH- 转移^的效率。这里合成了一系列基于聚苯并咪唑的 AEM（UTA-PBI- x），其具有梳状三阳离子侧链，包含两个二乙氧基间隔基和一个烷基间隔基。研究发现，在低IEC区域，氢键网络是离子传输的主要贡献，而水合离子通道将随着离子含量的增加而逐渐变得更加占主导地位。最佳 IEC 值为 1.40 mmol/g，OH ^-离子可以在所需的水合阳离子簇中快速转移，并通过薄的簇间含醚氢键网络域。同时，醚域保证了连续的非离子相以抵抗水膨胀。因此，UTA-PBI-1.40膜同时具有17.2%的低溶胀率、20℃下46.9 mS/cm的足够电导率、优异的机械强度（21.1 MPa）和良好的碱稳定性（剩余电导率约90%）在 1 M NaOH 中约 1400 小时。实现了高 OH- 传输效率⁽ σ/IEC ∼ 103.2)，优于最近报道的 AEM。在H ₂ /O _{2燃料电池中，超薄UTA-PBI-1.40膜在80°C时实现了861.6 mW/cm}²的峰值功率密度。这项工作为高效 OH- 转移 AEM 的设计提供了理论和实验^指导。

更新日期：2023-10-09

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