Reaction microenvironment control in membrane electrode assemblies for CO2 electrolysis

EES catalysis Pub Date : 2023-09-13 DOI:10.1039/D3EY00155E
Chuanchuan Yan, Dunfeng Gao, Juan-Jesús Velasco-Vélez and Guoxiong Wang
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Abstract

CO2 electrolysis is an emerging and promising carbon neutrality technology, but currently suffers from challenging selectivity issues at industrially relevant reaction rates. Selectivity control in CO2 electrolysis relies on the molecular understanding and manipulation of multiple parallel reaction pathways that are equally governed by catalytically active sites and the reaction microenvironments in their vicinity. In this perspective, we summarize and discuss the latest achievements in reaction microenvironment control for active, selective, energy- and carbon-efficient CO2 electrolysis, with particular attention being paid to that in membrane electrode assembly electrolyzers operating at industrial current densities (≥200 mA cm−2). The effects and underlying catalytic mechanisms of reaction microenvironments tailored by functional organic molecules/polymers and reactant feed compositions on the activity and selectivity of CO2 electrolysis are discussed using selected examples. The efforts made to tailor acidic reaction microenvironments by controlling the transport of reactive species for carbon-efficient CO2 electrolysis are also exemplified. Finally, we illustrate current challenges and future opportunities in the mechanistic understanding and rational design of reaction microenvironments for improving CO2 electrolysis performance.

Abstract Image

Abstract Image

用于二氧化碳电解的膜电极组件中的反应微环境控制
二氧化碳电解是一种新兴的、前景广阔的碳中和技术,但目前在工业相关反应速率方面存在着极具挑战性的选择性问题。二氧化碳电解的选择性控制依赖于对多种平行反应途径的分子理解和操纵,这些途径同样受催化活性位点及其附近反应微环境的支配。在这一视角中,我们总结并讨论了在活性、选择性、高能效和高碳效二氧化碳电解反应微环境控制方面取得的最新成果,尤其关注在工业电流密度(≥200 mA cm-2)下运行的膜电极组件电解器中的反应微环境控制。通过选定的实例,讨论了由功能性有机分子/聚合物和反应物进料成分定制的反应微环境对二氧化碳电解活性和选择性的影响及其催化机理。此外,我们还举例说明了通过控制反应物的运输来定制酸性反应微环境,从而实现碳高效二氧化碳电解的努力。最后,我们说明了在从机理上理解和合理设计反应微环境以提高二氧化碳电解性能方面当前面临的挑战和未来的机遇。
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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