膜科学与技术

咪唑鎓功能化长侧链聚苯醚阴离子膜的制备与性能研究

作者：高莉，焉晓明，贺高红

单位：大连理工大学精细化工国家重点实验室膜科学与技术研究中心化工学院，辽宁大连, 116024

关键词：阴离子膜；聚苯醚；咪唑鎓；电解水制氢

出版年,卷(期):页码： 2022,42(6):1-6

摘要：

以聚苯醚（PPO）为基材，与4-氟苯甲酰氯进行酰基化反应，接入4-氟苯甲酮侧链，而后与2-(4-羟苯基)乙醇进行缩合反应，再对醇羟基进行溴代，最后接入1,2-二甲基咪唑，得到了离子交换容量（IEC）为1.13-1.63 mmol g−1的咪唑鎓功能化长侧链PPO膜。膜的溶胀度和吸水率均随着IEC的增大而增大，而温度对其影响较小，仅IEC为1.63 mmol g−1的膜在80℃时变化相对明显。QPPO-PEImOH膜的离子传导率随着IEC的增加而增大，80℃时最高可以达到62 mS cm−1。QPPO-PEImOH膜具有良好的碱稳定性，在60℃碱稳定性测试168 h后，其IEC保留率为93%。将QPPO-PEImOH膜用于电解水制氢，在1 M KOH、温度为50 oC和电压为2.0 V时电流密度达到698 mA/cm2。

Imidazolium-functionalized long side chain PPO membranes (QPPO-PEImOH) was prepared by acylation, condensation, hydroxyl substitution by bromine, and subsequent functionalization. The ion exchange capacity (IEC) determined by back titration was 1.13–1.63 mmol g−1. The swelling ratio and water uptake of QPPO-PEImOH increased with the IEC, while it was insensitive to temperature change. The ionic conductivity of QPPO-PEImOH reached 62 mS cm−1 at 80 °C. In addition, QPPO-PEImOH showed good alkaline stability. The retention of IEC was 93% after immersing in 1 M NaOH for 168 h at 60 oC. The assembled AEM electrolyser achieve a current density of 698 mA/cm2 at 2.0 V and 50 °C under 1 M KOH-fed conditions.

高莉（1991-），女，山东淄博，博士研究生，阴离子膜

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