Mechanically robust poly[vinyl-(4-benzyl-N, N, N-trimethylammonium bromide) ketone]/polybenzimidazole blend membranes for anion conductive solid electrolytes
Mechanically robust poly[vinyl-(4-benzyl-N, N, N-trimethylammonium bromide) ketone]/polybenzimidazole blend membranes for anion conductive solid electrolytes
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用于阴离子导电固体电解质的机械坚固的聚[乙烯基-(4-苄基-N,N,N-三甲基溴化铵)酮]/聚苯并咪唑共混膜
DOI：
10.1016/j.memsci.2018.11.008
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发表时间：
2019
影响因子：
9.5
通讯作者：
Zhang Xuan
中科院分区：
文献类型：
--
作者：
Sui Yuqian;Hu Huayuan;Ueda Mitsuru;Wang Lianjun;Zhang Xuan
本研究采用传统的自由基聚合法合成了一种新型的聚[4-苄基-N，N，N-三甲基溴化铵](QA-PVBK)均聚物。进一步将QA-PVBK与市售的聚苯并咪唑(PBI)共混膜，作为新型阴离子交换膜材料。由于QA-PVBK的短重复单元，用于离子传输的离子团簇在微观尺度上高度聚集，这使得共混膜具有优异的氢氧化物导电性。PBI被引入作为一种物理增强，增强了膜的坚固性，并抑制了过度膨胀。PbI/QA-PVBK-OH膜(70%)在整个膜基质中的QA-PVBK-OH(氢氧化物形式)含量为70%，在60 °C下表现出50.8 ms cm−1的高氢氧化物电导率，因此在60 °C/100%相对湿度的H2/O2单电池测试中具有良好的峰值功率密度170.6 MW cm−2。在碱性条件下(1 M NaOH，60 °C)，共混膜也表现出了良好的化学稳定性，168 h后，膜的残余电导率超过59.4%。鉴于这些有希望的结果，本研究证明了一种简单的共混工艺，可以同时解决阴离子交换膜的离子电导率和机械性能。
In this study, a novel poly[vinyl-(4-benzyl-N,N,N-trimethylammonium bromide) ketone] (QA-PVBK) homopolymer was synthesized by conventional free-radical polymerization, followed by benzyl bromination, and in-situ quaternization reaction, successively. Blend membranes were further constructed between QA-PVBK and commercially available polybenzimidazole (PBI), as novel anion exchange membrane materials. Owing to the short repeating unit of QA-PVBK, the ion-clusters for the ion transport were highly aggregated on the microscale, which significantly contributed to the excellent hydroxide conductivity of the blend membranes. The PBI was introduced as a physical reinforcement, strengthening the membranes’ robustness and suppressing excessive swelling. Membrane PBI/QA-PVBK-OH(70%), with the QA-PVBK-OH (hydroxide form) content of 70% over the entire membrane matrix, exhibited a high hydroxide conductivity of 50.8 mS cm−1at 60 °C, and, consequently, a good peak power density of 170.6 mW cm−2at 60 °C/100% relative humidity condition in a H2/O2single cell test. The blend membranes also demonstrated acceptable chemical stability towards the alkaline condition (1 M NaOH at 60 °C) with the residual conductivity over 59.4% after 168 h. In light of these promising results, the present study demonstrates a facile blending process for simultaneously addressing the ion conductivity and mechanical properties of anion exchange membranes.