Composite membrane containing phytic acid-functionalized metal-organic frameworks for enhanced ion selectivity

IF 1.8 4区化学 Q3 POLYMER SCIENCE

High Performance Polymers Pub Date : 2024-06-24 DOI:10.1177/09540083241264625

Yuxia Zhang, Haojie Liu, Min Liu, Yitian Zhang, Chenjing Ding, Yunyun Gong

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引用次数: 0

Abstract

The application of sulfonated poly (ether ether ketone) (SPEEK) membrane in vanadium redox flow batteries (VRFBs) is hindered by the trade-off between proton conductivity and ion selectivity. To optimize its performance, the metal-organic frameworks loaded with phytic acid (PA-UiO-66-NH2) are introduced into the SPEEK matrix to construct a proton-selective transport channel. Better proton conductivity and ion selectivity are achieved in composite membranes due to the unique porous structure and chemical characteristics of PA-UiO-66-NH2 fillers. When the PA-UiO-66-NH2 content is at 2 wt%, the S/PA-UiO-66-NH2-2 membrane exhibits higher proton conductivity (35.3 mS cm−1) and ion selectivity (41.0 × 103 S min cm−3) compared to other composite membranes, pristine SPEEK and commercial Nafion 212 membranes. As a result, the S/PA-UiO-66-NH2-2 membrane shows excellent energy efficiencies (88.1%-74.0%) at current densities ranging from 60 to 180 mA cm−2. The cell efficiencies maintain stability during the 300 times charge-discharge cycle, proving the outstanding stability and durability of the S/PA-UiO-66-NH2-2 membrane in a strong acidic and oxidizing environment. These results suggest that the combination of phytic acid and metal-organic framework can effectively improve the performance of the membranes, and it also can be further utilized to solve other challenges in the membrane separation field.

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含有植酸功能化金属有机框架的复合膜，可提高离子选择性

磺化聚（醚醚酮）（SPEEK）膜在钒氧化还原液流电池（VRFB）中的应用因质子传导性和离子选择性之间的权衡而受到阻碍。为了优化其性能，在 SPEEK 基质中引入了含有植酸（PA-UiO-66-NH2）的金属有机框架，以构建质子选择性传输通道。由于 PA-UiO-66-NH2 填料独特的多孔结构和化学特性，复合膜具有更好的质子传导性和离子选择性。当 PA-UiO-66-NH2 含量为 2 wt% 时，与其他复合膜、原始 SPEEK 和商用 Nafion 212 膜相比，S/PA-UiO-66-NH2-2 膜具有更高的质子传导性（35.3 mS cm-1）和离子选择性（41.0 × 103 S min cm-3）。因此，S/PA-UiO-66-NH2-2 膜在 60 到 180 mA cm-2 的电流密度范围内显示出卓越的能量效率（88.1%-74.0%）。电池效率在 300 次充放电循环中保持稳定，证明了 S/PA-UiO-66-NH2-2 膜在强酸和强氧化环境中的出色稳定性和耐用性。这些结果表明，植酸与金属有机框架的结合能有效提高膜的性能，而且还能进一步用于解决膜分离领域的其他难题。

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

High Performance Polymers 化学-高分子科学

CiteScore

4.20

自引率

14.30%

发文量

106

审稿时长

1.2 months

期刊介绍： Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.

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