Enhanced selectivity of SPEEK membrane incorporated covalent organic nanosheet crosslinked graphene oxide for vanadium redox flow battery

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2024-10-15 DOI:10.1016/j.memsci.2024.123410

Yuxia Zhang , Haojie Liu , Min Liu , Xiangzhong Li , Yitian Zhang , Hongzhuo Sun , Haifeng Shi , Yuanyuan Feng

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引用次数: 0

Abstract

It is difficult for sulfonated poly(ether ether ketone) (SPEEK) to possess both high proton conduction and vanadium resistance owing to the degree of sulfonation. Herein, the composite membranes (S/GO-TpTG) with cationic covalent organic nanosheet (TpTG) crosslinked graphene oxide (GO-TpTG) are prepared to enhance selectivity by optimizing the ion transport channels. The GO-TpTG can efficiently transport protons utilizing its cationic porous structure and acid-base pairs' interaction with SPEEK. Meanwhile, it can block vanadium ions through the Donnan exclusion and physical blocking effects. The S/GO-TpTG membrane with 3 wt% GO-TpTG exhibits excellent proton conductivity (82.7 mS cm^-1) and selectivity (77.9×10^-7 cm² min^-1). The VRFB with this membrane exhibits excellent energy efficiency (88.6 - 81.0 % at 100-200 mA cm^-2), cycle durability, and self-discharge time (209.8 h). This study confirms the great potential of GO-COF to balance proton conductivity and vanadium resistance, and provides an effective strategy to optimize proton channels.

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掺入共价有机纳米片交联氧化石墨烯的 SPEEK 膜对钒氧化还原液流电池的选择性增强

由于磺化程度的原因，磺化聚醚醚酮（SPEEK）很难同时具有高质子传导性和耐钒性。本文制备了带有阳离子共价有机纳米片（TpTG）交联氧化石墨烯（GO-TpTG）的复合膜（S/GO-TpTG），通过优化离子传输通道来提高选择性。GO-TpTG 可利用其阳离子多孔结构和与 SPEEK 的酸碱对相互作用有效地传输质子。同时，它还能通过唐南排阻效应和物理阻断效应阻断钒离子。含有 3 wt% GO-TpTG 的 S/GO-TpTG 膜具有出色的质子传导性（82.7 mS cm-1）和选择性（77.9×10-7 cm2 min-1）。使用这种膜的 VRFB 在能量效率（100-200 mA cm-2 时为 88.6 - 81.0 %）、循环耐久性和自放电时间（209.8 h）方面都表现出色。这项研究证实了 GO-COF 在平衡质子传导性和钒电阻方面的巨大潜力，并为优化质子通道提供了一种有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.