Enhanced bipolar membrane for durable ampere-level water electrolysis

IF 32.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Energy & Environmental Science Pub Date : 2024-11-21 DOI:10.1039/d4ee04524f

Fen Luo, Weisheng Yu, Xiaojiang Li, Xian Liang, Wenfeng Li, Fanglin Duan, Yaoming Wang, Xiaolin Ge, Liang Wu, Tongwen Xu

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Abstract

Bipolar membrane (BPM) electrolyzers maintain a steady-state pH gradient, enabling optimal kinetics for electrode reactions. Traditional BPMs face issues with slow water dissociation (WD) kinetics and water transport limitations at high current densities, causing frequent failures during ampere-level electrolysis. This study introduces a durable BPM through strategic catalytic interface design and advanced membrane layer engineering. We synthesized a novel WD catalyst, 4-tertiary amine calix[4]arene-modified graphene oxide (GO-NCA), and integrated it into the BPM interface to enhance active site exposure and internal electric field strength for faster WD kinetics. The membrane, engineered to a thickness of ~32 µm, prevents interfacial delamination at high current densities. In a flow-cell electrolyzer, it achieved competitive cell voltages of 1.9 V at 1,000 mA cm–2 and 3.9 V at 6,500 mA cm–2. It also sustained over 500 hours of operation at 500 mA cm–2 and 60 °C, demonstrating exceptional durability. These findings set a new benchmark for BPM performance, advancing water electrolysis technology for practical applications.

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用于持久安培级电解水的增强型双极膜

双极膜（BPM）电解器可保持稳态 pH 梯度，使电极反应获得最佳动力学效果。传统的 BPM 面临着水解离（WD）动力学缓慢和高电流密度下水传输限制等问题，导致在安培级电解过程中频繁出现故障。本研究通过战略性的催化界面设计和先进的膜层工程，引入了一种耐用的 BPM。我们合成了一种新型 WD 催化剂--4-叔胺钙[4]烯改性氧化石墨烯（GO-NCA），并将其集成到 BPM 接口中，以增强活性位点暴露和内部电场强度，从而加快 WD 动力学。膜的设计厚度约为 32 微米，可防止高电流密度下的界面分层。在流式电解槽中，它在 1,000 mA cm-2 和 6,500 mA cm-2 的条件下分别达到了 1.9 V 和 3.9 V 的竞争性电池电压。此外，它还能在 500 mA cm-2 和 60 °C 的条件下持续工作 500 小时以上，显示出卓越的耐用性。这些研究结果为 BPM 性能树立了新的基准，推动了水电解技术的实际应用。

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

Energy & Environmental Science 化学-工程：化工

CiteScore

50.50

自引率

2.20%

发文量

349

审稿时长

2.2 months

期刊介绍： Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).