Tailoring microstructure of polysulfone composite membranes for alkaline water electrolysis

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2025-02-10 DOI:10.1016/j.memsci.2025.123830

Yaran Du , Haoyang Gao , Maliang Zhang , Kunmei Su , Zhenhuan Li

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Abstract

Alkaline water electrolysis (AWE) systems have been the focus of increasing attention in the green energy field due to their zero carbon emissions. The composite membrane, as a critical component of AWE, is typically used to enhance hydrogen production efficiency by incorporating nanofillers. However, over time, the separation of nanofillers can result in gas cross-permeation, thereby increasing operational risks. This study introduces polyethyleneimine (PEI) into the composite membrane, where hydrogen bonds are formed within the membrane, resulting in a composite membrane with a tunable microporous structure. The resulting composite membrane separator exhibited outstanding performance, achieving a maximum bubble point pressure of 3.96 bar and a decreased area resistance of 0.21 Ω cm². When subjected to a voltage of 2 V, the composite membrane separator achieved a current density of 896 mA cm⁻² at 80 °C in 30 wt% KOH, demonstrating excellent stability. Compared with existing advanced composite membranes, this membrane exhibited a notable advantage in terms of electrolytic performance. This study offers crucial insights for advancing the development of high-performance AWE membranes.

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碱性水电解（AWE）系统因其零碳排放而成为绿色能源领域日益关注的焦点。复合膜作为 AWE 的重要组成部分，通常通过加入纳米填料来提高制氢效率。然而，随着时间的推移，纳米填料的分离会导致气体交叉渗透，从而增加操作风险。本研究将聚乙烯亚胺（PEI）引入复合膜，在膜内形成氢键，从而形成具有可调微孔结构的复合膜。由此产生的复合膜分离器性能卓越，最大气泡点压力达到 3.96 巴，面积电阻减小到 0.21 Ω cm2。在 30 wt% KOH 溶液中，当电压为 2 V 时，复合膜分离器在 80 °C 下的电流密度达到 896 mA cm-2，表现出卓越的稳定性。与现有的先进复合膜相比，这种膜在电解性能方面具有显著优势。这项研究为推动高性能 AWE 膜的开发提供了重要启示。

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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.