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Issue 10, 2018
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Carbon dioxide splitting using an electro-thermochemical hybrid looping strategy

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Abstract

Reclaiming oxygen (O2) efficiently from carbon dioxide (CO2), a major product of human metabolism, is a key technology to minimize the oxygen supply required for challenging missions such as manned deep space exploration. Ideally, a method that can convert CO2 into elemental carbon (C) and O2 under mild conditions is highly desirable; however, due to the highly unfavorable thermodynamics, direct CO2 splitting requires extreme conditions. Herein, we present an electro-thermochemical hybrid looping (ETHL) strategy to split CO2 into C and O2 under mild conditions with a 100% theoretical oxygen recovery efficiency, which cannot be accomplished using any existing electrochemical or thermochemical process. The ETHL process combines an electrochemical step that reduces CO2 into carbon monoxide (CO) with a thermochemical step that further converts CO into C and CO2. By recycling the produced CO2 from the thermochemical step back to the first electrochemical step, this closes the loop with C and O2 as the only products. The results showed 96% selectivity for the CO2 electrolysis step and nearly 100% selectivity for the CO thermochemical step, demonstrating the feasibility of the ETHL strategy for complete oxygen recovery from CO2.

Graphical abstract: Carbon dioxide splitting using an electro-thermochemical hybrid looping strategy

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Publication details

The article was received on 15 Feb 2018, accepted on 06 Jul 2018 and first published on 09 Jul 2018


Article type: Paper
DOI: 10.1039/C8EE00532J
Citation: Energy Environ. Sci., 2018,11, 2928-2934
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    Carbon dioxide splitting using an electro-thermochemical hybrid looping strategy

    W. Luc, M. Jouny, J. Rosen and F. Jiao, Energy Environ. Sci., 2018, 11, 2928
    DOI: 10.1039/C8EE00532J

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