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Conversion of Reactive Carbon Solutions into CO at Low Voltage and High Carbon Efficiency
ACS Central Science ( IF 12.7 ) Pub Date : 2022-05-31 , DOI: 10.1021/acscentsci.2c00329
Zishuai Zhang 1 , Eric W Lees 2 , Shaoxuan Ren 1 , Benjamin A W Mowbray 1 , Aoxue Huang 1 , Curtis P Berlinguette 1, 2, 3, 4
Affiliation  

Electrolyzers are now capable of reducing carbon dioxide (CO2) into products at high reaction rates but are often characterized by low energy efficiencies and low CO2 utilization efficiencies. We report here an electrolyzer that reduces 3.0 M KHCO3(aq) into CO(g) at a high rate (partial current density for CO of 220 mA cm–2) and a CO2 utilization efficiency of 40%, at a voltage of merely 2.3 V. These results were made possible by using: (i) a reactive carbon solution enriched in KHCO3 as the feedstock instead of gaseous CO2; (ii) a cation exchange membrane instead of an anion exchange membrane, which is common to the field; and (iii) the hydrogen oxidation reaction (HOR) at the anode instead of the oxygen evolution reaction (OER). The voltage reported here is the lowest reported for any CO2 to CO electrolyzer that operates at high current densities (i.e., a partial current density for CO greater than 200 mA cm–2) with a CO2 utilization efficiency of greater than 20%. This study highlights how the choice of feedstock, membrane, and anode chemistries affects the rate and efficiency at which CO2 is converted into products.

中文翻译:

在低电压和高碳效率下将活性碳溶液转化为 CO

电解槽现在能够以高反应速率将二氧化碳 (CO 2 ) 还原成产物,但通常以低能量效率和低 CO 2利用率为特征。我们在此报告了一种电解槽,该电解槽以高速率将 3.0 M KHCO 3 (aq) 还原为 CO(g)(CO 的部分电流密度为 220 mA cm –2),CO 2利用率为 40%,电压为仅 2.3 V。这些结果是通过使用以下方法实现的:(i) 富含 KHCO 3的活性碳溶液代替气态 CO 2作为原料; (ii) 阳离子交换膜代替本领域常用的阴离子交换膜;(iii) 阳极的氢氧化反应 (HOR) 代替析氧反应 (OER)。这里报告的电压是任何在高电流密度(即,CO 的部分电流密度大于 200 mA cm -2)下运行且 CO 2利用率大于 20%的 CO 2制 CO 电解槽中报告的最低电压。本研究强调了原料、膜和阳极化学成分的选择如何影响 CO 2转化为产品的速率和效率。
更新日期:2022-05-31
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