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Electrochemical carbon dioxide capture to close the carbon cycle
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2020-12-18 , DOI: 10.1039/d0ee03382k
R. Sharifian 1, 2, 3, 4, 5 , R. M. Wagterveld 4, 5, 6, 7 , I. A. Digdaya 8, 9, 10, 11 , C. Xiang 8, 9, 10, 11 , D. A. Vermaas 1, 2, 3, 4
Affiliation  

Electrochemical CO2 capture technologies are gaining attention due to their flexibility, their ability to address decentralized emissions (e.g., ocean and atmosphere) and their fit in an electrified industry. In the present work, recent progress made in electrochemical CO2 capture is reviewed. The majority of these methods rely on the concept of “pH-swing” and the effect it has on the CO2 hydration/dehydration equilibrium. Through a pH-swing, CO2 can be captured and recovered by shifting the pH of a working fluid between acidic and basic pH. Such swing can be applied electrochemically through electrolysis, bipolar membrane electrodialysis, reversible redox reactions and capacitive deionization. In this review, we summarize main parameters governing these electrochemical pH-swing processes and put the concept in the framework of available worldwide capture technologies. We analyse the energy efficiency and consumption of such systems, and provide recommendations for further improvements. Although electrochemical CO2 capture technologies are rather costly compared to the amine based capture, they can be particularly interesting if more affordable renewable electricity and materials (e.g., electrode and membranes) become widely available. Furthermore, electrochemical methods have the ability to (directly) convert the captured CO2 to value added chemicals and fuels, and hence prepare for a fully electrified circular carbon economy.

中文翻译:

电化学捕获二氧化碳以关闭碳循环

电化学CO 2捕集技术因其灵活性,解决分散排放(例如海洋和大气)的能力以及其在电气化行业中的应用而受到关注。在目前的工作中,回顾了电化学CO 2捕获的最新进展。这些方法中的大多数都依赖于“ pH波动”的概念及其对CO 2水合/脱水平衡的影响。通过pH波动,CO 2可以通过在酸性和碱性pH值之间转换工作液的pH值来捕获和回收。这种摆动可以通过电解,双极膜电渗析,可逆氧化还原反应和电容去离子来电化学施加。在这篇综述中,我们总结了控制这些电化学pH波动过程的主要参数,并将这一概念置于全球可用的捕获技术框架内。我们分析了此类系统的能源效率和能耗,并提出了进一步改进的建议。尽管与胺基捕集相比,电化学CO 2捕集技术的成本相当高,但如果可负担得起的可再生电力和材料(例如,,电极和膜)变得广泛可用。此外,电化学方法具有将捕获的CO 2(直接)转化为增值化学品和燃料的能力,从而为完全带电的循环碳经济做准备。
更新日期:2021-01-12
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