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Carbon dioxide splitting using an electro-thermochemical hybrid looping strategy†
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2018-07-09 00:00:00 , DOI: 10.1039/c8ee00532j
Wesley Luc 1, 2, 3, 4 , Matthew Jouny 1, 2, 3, 4 , Jonathan Rosen 1, 2, 3, 4 , Feng Jiao 1, 2, 3, 4
Affiliation  

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.

中文翻译:

使用电热化学混合循环策略裂解二氧化碳

从二氧化碳(CO 2)(人类新陈代谢的主要产物)中有效地回收氧气(O 2)是一项关键技术,可最大程度地减少挑战性任务(如载人深空探测)所需的氧气供应。理想地,非常需要在温和的条件下将CO 2转化为元素碳(C)和O 2的方法。然而,由于高度不利的热力学,直接的CO 2分解需要极端的条件。在这里,我们提出了一种电热化学混合循环(ETHL)策略,将CO 2分为C和O 2在温和条件下的理论氧气回收效率为100%,这是使用任何现有的电化学或热化学方法都无法实现的。ETHL工艺将将CO 2还原为一氧化碳(CO)的电化学步骤与将CO进一步转化为C和CO 2的热化学步骤结合在一起。通过将所产生的CO 2从热化学步骤循环回第一电化学步骤,从而以C和O 2为唯一产物封闭了回路。结果表明,CO 2电解步骤的选择性为96%,CO热化学步骤的选择性为近100%,这表明ETHL策略从CO 2中完全回收氧气的可行性
更新日期:2018-07-09
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