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How membrane characteristics influence the performance of CO2 and CO electrolysis
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-09-15 , DOI: 10.1039/d2ee01818g
Sahil Garg, Carlos A. Giron Rodriguez, Thomas E. Rufford, John R. Varcoe, Brian Seger

Due to the ability to produce sustainably carbon-based chemicals and fuels, CO2 electrolysis and the closely related CO electrolysis are advancing rapidly from fundamental studies toward industrial applications. Many near-room temperature CO2 and CO electrolysis (CO(2)E) technologies adopt features from proton exchange membrane fuel cells and H2 electrolyzers. However, CO(2)E's selectivity and overall performance are highly sensitive to a multitude of parameters, adding an extra degree of complexity. One often-overlooked parameter in optimizing these devices is the ion exchange membranes (IEM). Here we critically review the IEM performance variables of most relevance to CO(2)E, which leads to identifying several parameters in need of substantial more scientific understanding. We begin with a summary of the working principles of the three main IEM types for CO(2)E, then focus on anion exchange membranes (AEM) since AEMs provide the most favorable local alkaline environment for CO(2)E at the cathode. Critical issues for AEMs in CO2E include (i) ion and water transport in the membrane, (ii) ionic conductivity, and (iii) chemical stability. We conclude with an overview of the state-of-the-art IEM reported in high current density (j ≥ 100 mA cm−2) CO2 and CO electrolysis devices.

中文翻译:

膜特性如何影响 CO2 和 CO 电解的性能

由于能够生产可持续的碳基化学品和燃料,CO 2电解和与之密切相关的 CO 电解正从基础研究迅速向工业应用发展。许多接近室温的 CO 2和 CO 电解 (CO (2) E) 技术采用了质子交换膜燃料电池和 H 2电解器的特点。然而,CO (2) E 的选择性和整体性能对众多参数高度敏感,从而增加了额外的复杂性。优化这些设备的一个经常被忽视的参数是离子交换膜 (IEM)。在这里,我们批判性地回顾了与 CO 最相关的 IEM 性能变量(2)E,这导致确定需要大量更科学理解的几个参数。我们首先总结了 CO (2) E的三种主要 IEM 类型的工作原理,然后重点介绍阴离子交换膜 (AEM),因为 AEM在阴极为 CO (2) E 提供了最有利的局部碱性环境。CO 2 E 中 AEM 的关键问题包括 (i) 膜中的离子和水传输,(ii) 离子电导率,和 (iii) 化学稳定性。最后,我们概述了在高电流密度 ( j ≥ 100 mA cm -2 ) CO 2和 CO 电解装置中报告的最先进的 IEM 。
更新日期:2022-09-15
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