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Metal-Oxide Interfaces for Selective Electrochemical C-C Coupling Reactions

Authors
Lee, Chan WooShin, Seung-JaeJung, HyejinDang Le Tri NguyenLee, Si YoungLee, Woong HeeWon, Da HyeKim, Min GyuOh, Hyung-SukJang, TaehwanKim, HyungjunMin, Byoung KounHwang, Yun Jeong
Issue Date
9월-2019
Publisher
AMER CHEMICAL SOC
Citation
ACS ENERGY LETTERS, v.4, no.9, pp.2241 - 2248
Indexed
SCIE
SCOPUS
Journal Title
ACS ENERGY LETTERS
Volume
4
Number
9
Start Page
2241
End Page
2248
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/63060
DOI
10.1021/acsenergylett.9b01721
ISSN
2380-8195
Abstract
Metal-oxide interfaces provide a new opportunity to improve catalytic activity based on electronic and chemical interactions at the interface. Constructing a high density of interfaces is essential in maximizing synergistic interactions. Here, we demonstrate that Cu-ceria interfaces made by sintering nanocrystals facilitate C-C coupling reactions in electrochemical reduction of CO2. The Cu/ceria catalyst enhances the selectivity of ethylene and ethanol production with the suppression of H-2 evolution in comparison with Cu catalysts. The intrinsic activity for ethylene production is enhanced by decreasing the atomic ratio of Cu/Ce, revealing the Cu atoms near ceria are an active site for C-C coupling reactions. The ceria is proposed to weaken the hydrogen binding energy of adjacent Cu sites and stabilize an *OCCO intermediate via an additional chemical interaction with an oxygen atom of the *OCCO. This work offers new insights into the role of the metal-oxide interface in the electrochemical reduction of CO2 to high-value chemicals.
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