High-performance twisted ether-free polymer based anion exchange membranes with crown ether units

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-09-28 DOI:10.1016/j.molstruc.2025.144192

Shiwen Zhang, Yang Zhang, Fan Zhang, Lulu Wang, Lingzhi Xiong, Shuanglong Xiao, Shaoji Wang, Jilin Wang

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Abstract

Crown ether, as a hydrophilic group, is capable of forming complexes with metal cations and serves as a key component for constructing supramolecular assemblies. This functionality allows it to dynamically capture anchor points, enhance ion aggregation, and improve the hydroxide conductivity. However, the high hydrophilicity of crown ether can lead to excessive swelling, which limits its application. Therefore, this study designs ether-free AEMs containing crown ether, m-terphenyls and piperidine through superacid-catalyzed synthesis, and are used in fuel cells. PMDTP-15 not only achieves efficient conduction of OH⁻ (130.7 mS·cm⁻¹, 80 °C), but also effectively limits the swelling of the membrane (19.1 %, 80 °C) and exhibits excellent alkali stability (after being immersed in 1 M NaOH solution for 1680 h, the conductivity remained 95.34 %, and the mechanical properties decreased by 1.13 %) due to the high hydrophilicity and m-terphenyl torque structure of the crown ether structure. In addition, the peak power density of a single PMDTP-15 cell can reach 1043 mW·cm⁻², and the voltage can maintain 90 % of the original performance after 120 h.

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具有冠醚单元的高性能无扭醚聚合物阴离子交换膜

冠醚作为一种亲水基团，能够与金属阳离子形成配合物，是构建超分子组装体的关键组分。这种功能使其能够动态捕获锚点，增强离子聚集，并提高氢氧化物的导电性。然而，冠醚的高亲水性会导致过度膨胀，这限制了它的应用。因此，本研究通过超强酸催化合成，设计了含有冠醚、间terphenyls和哌啶的无醚AEMs，并将其应用于燃料电池。由于冠醚结构的高亲水性和间ter苯基转矩结构，PMDTP-15不仅实现了OH−的高效导电（130.7 mS·cm−1,80°C），而且有效地限制了膜的膨胀（19.1%,80°C），并表现出优异的碱稳定性（在1 M NaOH溶液中浸泡1680 h后，电导率仍保持95.34%，力学性能下降1.13%）。此外，PMDTP-15单体电池的峰值功率密度可达1043 mW·cm−2,120 h后电压可保持原来性能的90%。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.