法拉第效率
氨
化学
电化学
锂(药物)
无机化学
二氧化碳
氨生产
析氧
氧气
氮气
有机化学
电极
物理化学
医学
内分泌学
作者
Katja Li,Suzanne Z. Andersen,Michael J. Statt,Mattia Saccoccio,Vanessa Jane Bukas,Kevin Krempl,Rokas Sažinas,Jakob B. Pedersen,Vahid Shadravan,Yuanyuan Zhou,Debashis Chakraborty,Jakob Kibsgaard,Peter C. K. Vesborg,Jens K. Nørskov,Ib Chorkendorff
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2021-12-24
卷期号:374 (6575): 1593-1597
被引量:131
标识
DOI:10.1126/science.abl4300
摘要
Owing to the worrying increase in carbon dioxide concentrations in the atmosphere, there is a need to electrify fossil-fuel–powered chemical processes such as the Haber-Bosch ammonia synthesis. Lithium-mediated electrochemical nitrogen reduction has shown preliminary promise but still lacks sufficient faradaic efficiency and ammonia formation rate to be industrially relevant. Here, we show that oxygen, previously believed to hinder the reaction, actually greatly improves the faradaic efficiency and stability of the lithium-mediated nitrogen reduction when added to the reaction atmosphere in small amounts. With this counterintuitive discovery, we reach record high faradaic efficiencies of up to 78.0 ± 1.3% at 0.6 to 0.8 mole % oxygen in 20 bar of nitrogen. Experimental x-ray analysis and theoretical microkinetic modeling shed light on the underlying mechanism.
科研通智能强力驱动
Strongly Powered by AbleSci AI