Hydrophobicity Regulation of Hyperbranched Poly(Aryl Piperidine) Anion Exchange Membranes for Fuel Cells

IF 5.1 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2024-09-19 DOI:10.1021/acs.macromol.4c01260

Xiaoqin Ma, Aidi Liu, Jingtao Si, Qiong Xiang, Wei Yuan, Xiaoli Lu, Caili Yuan, Baoshu Chen, Wei Luo, Jianchuan Wang, Zidong Wei

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Abstract

As a key component of anion exchange membrane fuel cells, anion exchange membranes (AEMs) must exhibit outstanding comprehensive performance. Hyperbranched AEMs have garnered increasing attention due to their superior hydroxide conductivity compared to linear AEMs. However, while the loose chain entanglement of hyperbranched AEMs effectively reduces the mass transfer resistance, it also leads to excessive water uptake and high membrane swelling. Herein, a series of alkyl chains with different lengths are introduced into the hyperbranched AEMs to regulate their hydrophobicity, further affecting the membrane performance. Enhancing hydrophobicity effectively controls water absorption (52.8–15%@80 °C) and achieves extremely low membrane swelling (4.6%@80 °C). Although hydroxide conductivity is impacted by the enhanced hydrophobicity, hbQPTP-Cn AEMs still maintain high ion conductivity (>200 mS/cm@80 °C) due to the construction of ionic clusters induced by the hydrophobic phase. Regulating the hydrophobicity of AEMs also benefits the enhancement of alkaline resistance and water management during fuel cell operation.

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用于燃料电池的超支化聚（芳基哌啶）阴离子交换膜的疏水性调控

作为阴离子交换膜燃料电池的关键部件，阴离子交换膜（AEM）必须具有出色的综合性能。与线性 AEM 相比，超支化 AEM 具有更出色的氢氧化物传导性，因此受到越来越多的关注。然而，超支化 AEM 松散的链缠结虽然能有效降低传质阻力，但也会导致过多的吸水和膜的高度膨胀。在此，我们在超支化 AEM 中引入了一系列不同长度的烷基链，以调节其疏水度，从而进一步影响膜的性能。增强疏水性可有效控制吸水率（52.8-15%@80 °C），并实现极低的膜膨胀率（4.6%@80 °C）。虽然氢氧化物电导率受到疏水性增强的影响，但 hbQPTP-Cn AEMs 仍能保持较高的离子电导率（>200 mS/cm@80 °C），这是由于疏水相诱导形成了离子簇。调节 AEM 的疏水性还有利于提高燃料电池的耐碱性和运行过程中的水管理。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.