化工学报

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碱性离子膜内强化离子传递策略及研究进展

庞茂斌(), 徐子昂, 甄翊含, 许琴, 林董澄, 刘京, 王保国()   

  1. 清华大学化学工程系,北京 100084
  • 收稿日期:2024-04-23 修回日期:2024-06-12 出版日期:2024-07-17
  • 通讯作者: 王保国
  • 作者简介:庞茂斌(1999—),男,博士研究生,pmb21@mails.tsinghua.edu.cn
  • 基金资助:
    国家自然科学基金项目(22278239);国家重点研发计划(2022YFB2404903)

Recent progress of strategies for enhanced ion transport in anion exchange membranes

Maobin PANG(), Zi'ang XU, Yihan ZHEN, Qin XU, Dongcheng LIN, Jing LIU, Baoguo WANG()   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2024-04-23 Revised:2024-06-12 Online:2024-07-17
  • Contact: Baoguo WANG

摘要:

碱性离子膜(阴离子交换膜)作为电解水制氢、二氧化碳还原等电化学过程的关键材料,在传递离子、分隔阴阳两极和阻隔气体渗透方面,具有重要应用价值。现有碱性离子膜起源于电渗析过程,其离子传导率偏低,无法满足电化学过程对高电流密度、高稳定性需求。针对电解水制氢过程对高通量、低电阻、低能耗的需求,本文从膜内离子传递过程出发,结合氢氧根传递特点,分析满足综合性能需求的碱性离子膜结构特征,重点阐述膜内强化离子传递策略。归纳分析最新研究成果,分类讨论交联、定向排列、微相分离以及构筑微孔等具体策略,指明高性能碱性离子膜研究路径,促进以电解水制氢为代表的电化学反应器技术发展。

关键词: 碱性离子膜, 自由体积理论, 离子传递, 离子传导率, 电解水

Abstract:

As key materials in electrochemical processes such as water electrolysis and CO2 electroreduction, anion exchange membranes have important application value in ions transport, separating anode and cathode, and blocking gas penetration. Originating from electrodialysis process, most commercial anion exchange membranes have low conductivity, which can't meet the demand of high current density and high stability in electrochemical process. For demands of high flux, low resistance and low energy consumption in water electrolysis, this work investigates ions transport in membranes, combined with features of hydroxide ions, analyzes the structural characteristics of anion exchange membranes that meet the comprehensive performance requirements, and focuses on the strategies of enhanced ion transport. The latest research are summarized, and specific strategies such as cross-linking, directional alignment, microphase separations and micropore construction are discussed, indicating the direction of high-performance anion exchange membranes, and promoting the development of electrochemical progresses such as water electrolysis.

Key words: anion exchange membrane, free volume theory, ion transport, ion conductivity, water electrolysis

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