纳米棒
法拉第效率
电化学
材料科学
催化作用
电流密度
二氧化碳电化学还原
电极
化学工程
选择性
可逆氢电极
纳米颗粒
纳米技术
化学
工作电极
一氧化碳
物理
物理化学
工程类
生物化学
量子力学
作者
Ilias Stamatelos,Cao-Thang Dinh,Werner Lehnert,Meital Shviro
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-10-26
卷期号:5 (11): 13928-13938
被引量:9
标识
DOI:10.1021/acsaem.2c02557
摘要
Practical electrochemical carbon dioxide (CO2) reduction requires the development of selective and stable catalysts based on low-cost and Earth-abundant materials. In this work, we develop catalysts for CO2 conversion to CO based on ZnO with various morphologies, including nanoparticles, nanorods, nanosheets, and random shapes. We found that ZnO nanorods exhibit the highest CO2 to CO efficiency, with a high CO Faradaic efficiency (FE) of over 80% in a current density range of 50–160 mA cm2 in both flow-cell and membrane electrode assembly (MEA) reactors. We found that the CO selectivity of ZnO-based catalysts slowly decreased over time at high current densities because of the depletion of the ZnO phase. We have developed an in-situ regeneration strategy for catalysts that involves periodic oxidations of the catalysts during electrochemical CO2 reduction. Using this approach, we have demonstrated the conversion of CO2 to CO with a stable CO FE of above 80% for 100 h at a current density of 160 mA cm–2.
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