材料科学
电化学
纳米棒
催化作用
金属
氧化态
还原(数学)
化学工程
无机化学
选择性
电极
分析化学(期刊)
纳米技术
物理化学
化学
冶金
生物化学
色谱法
工程类
数学
几何学
作者
Seungwon Hong,Hafiz Ghulam Abbas,Kyuseon Jang,Kshirodra Kumar Patra,Beomil Kim,Byeong-Uk Choi,Hakhyeon Song,Kug‐Seung Lee,Pyuck‐Pa Choi,Stefan Ringe,Jihun Oh
标识
DOI:10.1002/adma.202208996
摘要
Ceria (CeO2 ) is one of the most extensively used rare earth oxides. Recently, it has been used as a support material for metal catalysts for electrochemical energy conversion. However, to date, the nature of metal/CeO2 interfaces and their impact on electrochemical processes remains unclear. Here, a Cu-CeO2 nanorod electrochemical CO2 reduction catalyst is presented. Using operando analysis and computational techniques, it is found that, on the application of a reductive electrochemical potential, Cu undergoes an abrupt change in solubility in the ceria matrix converting from less stable randomly dissolved single atomic Cu2+ ions to (Cu0 ,Cu1+ ) nanoclusters. Unlike single atomic Cu, which produces C1 products as the main product during electrochemical CO2 reduction, the coexistence of (Cu0 ,Cu1+ ) clusters lowers the energy barrier for C-C coupling and enables the selective production of C2+ hydrocarbons. As a result, the coexistence of (Cu0 ,Cu1+ ) in the clusters at the Cu-ceria interface results in a C2+ partial current density/unit Cu weight 27 times that of a corresponding Cu-carbon catalyst under the same conditions.
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