Ultrahigh ion selectivity composite membrane contained cationic covalent organic nanosheets for vanadium redox flow battery

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL Journal of Membrane Science Pub Date : 2024-09-07 DOI:10.1016/j.memsci.2024.123314

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Abstract

Sulfonated poly(ether ether ketone) (SPEEK) is widely explored as the proton exchange membrane (PEM). However, it is difficult for it to have both good proton conductivity and vanadium resistance. Herein, the ionic-covalent organic nanosheets (TpTG_Cl) were fabricated and added to the SPEEK matrix. The nitrogen-rich and positive charge porous structure of TpTG_Cl nanosheets endowed the composite membrane with the ability to transfer H⁺ and block V^n + effectively. When the TpTG_Cl weight proportion was 3 %, the ion selectivity of the SP/TpTG-3 is as high as 103.3 × 10³ S min cm⁻³. As expected, the SP/TpTG-3 exhibits outstanding energy efficiency (87.0%–77.4 % at 60–180 mA cm⁻²) and long-cycle stability. The results suggested that the ionic-covalent organic nanosheets afforded opportunities to prepare high performance PEM.

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用于钒氧化还原液流电池的含有阳离子共价有机纳米片的超高离子选择性复合膜

磺化聚醚醚酮（SPEEK）被广泛用作质子交换膜（PEM）。然而，它很难同时具有良好的质子传导性和耐钒性。在此，我们制作了离子共价有机纳米片（TpTGCl），并将其添加到 SPEEK 基质中。TpTGCl 纳米片的富氮和正电荷多孔结构赋予了复合膜有效传输 H+ 和阻挡 Vn + 的能力。当 TpTGCl 的重量比例为 3 % 时，SP/TpTG-3 的离子选择性高达 103.3 × 103 S min cm-3。正如预期的那样，SP/TpTG-3 具有出色的能量效率（60-180 mA cm-2 时为 87.0%-77.4 %）和长周期稳定性。结果表明，离子共价有机纳米片为制备高性能 PEM 提供了机会。

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来源期刊

Journal of Membrane Science 工程技术-高分子科学

CiteScore

17.10

自引率

17.90%

发文量

1031

审稿时长

2.5 months

期刊介绍： The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.