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Effect of chain hydrophobicity on poly(carbazolyl terphenyl piperidinium) anion exchange membranes

Authors： Cai Zhihong , Zhang Qiugen , Zhu Aimei, Liu Qinglin

Units： The College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

KeyWords： fuel cells; anion exchange membrane; flexible chain

ClassificationCode：TQ028； O632.7

year,volume(issue):pagination： 2023,43(6):79-88

Abstract：

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.

Funds：

国家自然基金面上项目(22078272 & 22278340)

AuthorIntro：

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

Reference：

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