Partially fluorinated, multication cross-linked poly(arylene piperidinium) membranes with improved conductivity and reduced swelling for fuel cell application
Partially fluorinated, multication cross-linked poly(arylene piperidinium) membranes with improved conductivity and reduced swelling for fuel cell application
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DOI：
10.1007/s11581-020-03721-3
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发表时间：
2020-08
期刊：
影响因子：
2.8
通讯作者：
Yabin Jia;Lingling Ma;Qingyu Yu;Naeem Akhtar Qaisrani;Lv Li;Rui-Sha Zhou;G. He;Fengxiang Zhang-
中科院分区：
文献类型：
--
作者：
Yabin Jia;Lingling Ma;Qingyu Yu;Naeem Akhtar Qaisrani;Lv Li;Rui-Sha Zhou;G. He;Fengxiang Zhang-
作为碱性膜燃料电池的重要组成部分，阴离子交换膜（AEM）经常面临离子电导率和化学/尺寸稳定性之间的权衡。本文报道了一种多阳离子交联的部分氟化聚（芳烯哌啶）AEM，该AEM由1,1,1-三氟丙酮、n -甲基-4-哌啶酮、联苯共聚，然后与N1， N6-二（6-溴己基）-N1, N1, N6， N6-四甲基己烷-1,6-溴化二铵交联而成。在80°C （IEC = 2.9 mmol g−1）下，AEM的OH -电导率为148.7 mS cm−1，这可能促进了微相分离，从而产生了宽的离子传导通道。与未部分氟化的AEM相比，氟化AEM在80°C时的溶胀率较低（33%对58%）。在1 M NaOH中，在80℃下处理1700 h后，AEM的离子电导率仍保持在85%。此外，与AEM组装在一起的H2/ o2燃料电池在60°C时的峰值功率密度为208 mW cm - 2。我们的工作成功地证明了部分氟化骨架和多离子交联结构在抑制膜膨胀的同时保持高导电性的协同作用；有利于更好地平衡AEM电导率和鲁棒性。具有多阳离子交联的部分氟化聚（芳烯哌啶）AEM。与不含氟的膜相比，制备的膜具有更高的导电性和更低的肿胀。
As an important component in alkaline membrane fuel cells, anion exchange membrane (AEM) often suffers from the tradeoff between ionic conductivity and chemical/dimensional stability. We herein report a partially fluorinated poly(arylene piperidinium) AEM with multication cross-links, which was synthesized by copolymerizing 1,1,1-trifluoroacetone, N-methyl-4-piperidone, biphenyl, and subsequent cross-linking with N1, N6-bis(6-bromohexyl)-N1, N1, N6, N6-tetramethylhexane-1,6-diammonium bromide. The resultant AEM exhibited an excellent OH−conductivity of 148.7 mS cm−1at 80 °C (IEC = 2.9 mmol g−1) due to the multication structure, which may promote microphase separation to produce wide ion-conducting channels. Compared with those without partial fluorination, the fluorinated AEM showed lower swelling ratio (33% vs. 58% at 80 °C). The ionic conductivity of the AEM remained by 85% after it was treated 1700 h in 1 M NaOH at 80 °C. In addition, the H2/O2fuel cell assembled with the AEM yielded a peak power density of 208 mW cm−2at 60 °C. Our work successfully demonstrates the synergistic effect of partially fluorinated backbone and multication cross-linked structure to inhibit membrane swelling while keeping high conductivity; it is beneficial for better balancing AEM conductivity and robustness.Partially fluorinated poly(arylene piperidinium) AEM with multication cross-links. The fabricated membrane showed higher conductivity and much lower swelling compared with its non-fluorinated counterpart.