膜科学与技术

链段疏水性对聚咔唑基三联苯基哌啶阴离子交换膜的影响

作者：蔡志鸿，张秋根，朱爱梅，刘庆林

单位：厦门大学化学化工学院，福建省厦门市 361000

关键词：燃料电池；阴离子交换膜；柔性链段

出版年,卷(期):页码： 2023,43(6):79-88

摘要：

通过引入不同疏水性的柔性链段(含氟链段、烷基链段和含羟基链段)可以提升阴离子交换膜(AEM)的性能。本文着重介绍通过超酸催化反应制备的3种AEM，分别为含氟戊烷与1-己基-1-甲基哌啶鎓的聚咔唑基三联苯基哌啶(PCTPPF)、含正己烷与1-己基-1-甲基哌啶鎓的聚咔唑基三联苯基哌啶(PCTPPC)和含戊醇与1-己基-1-甲基哌啶鎓的聚咔唑基三联苯基哌啶(PCTPPO)。本文重点通过测试接触角、溶胀率、电化学电阻和单电池性能，来表征AEM的亲疏水性、离子电导率、碱性稳定性和单电池功率密度等性能。其中，强疏水性的PCTPPF具有低溶胀(14.9%, 80 ℃)的特性，而且其离子电导率(160.4 mS/cm, 80 ℃)和单电池功率密度(646 mW/cm2, 80 ℃)均具有优势。而亲水链段的PCTPPO能够在较为恶劣的碱性环境中维持高离子电导保留率(86.3%, 2 M NaOH)。相较于PCTPPF和PCTPPO，PCTPPC的各项性能则较为均衡。

The performance of anion exchange membranes (AEMs) is improved by introducing flexible chains (fluorine-containing, alkyl-containing and hydroxyl-containing chains) with different hydrophobicities. This article focuses on three AEMs prepared through superacid-catalyzed condensation reaction, namely poly(carbazolyl terphenyl piperidinium) containing fluoropentane and 1-hexyl-1-methylpiperidium (PCTPPF), poly(carbazolyl terphenyl piperidinium) containing hexane and 1-hexyl-1-methylpiperidium (PCTPPC), and poly(carbazolyl terphenyl piperidinium) containing pentanol and 1-hexyl-1-methylpiperidium (PCTPPO). This article focuses on characterizing the hydrophilicity and hydrophobicity, ionic conductivity, alkaline stability and single cell power density of AEM by testing contact angle, swelling ratio, electrochemical resistance and single cell performance. Among them, PCTPPF with a strong hydrophobicity have a low swelling ratio (14.9%, 80 ℃), an excellent ionic conductivity (160.4 mS/cm, 80 ℃) and single cell performance (646 mW/cm2, 80 ℃). However, the hydrophilic PCTPPO can maintain a high ionic conductivity retention (86.3%, 2 mol/L NaOH) in a harsh alkaline environment. Compared with PCTPPF and PCTPPO, the performance of PCTPPC is balanced.

蔡志鸿(1997-)，男，福建省南平市人，硕士研究生，主要从事功能膜材料的制备

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