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

Chan Woo Lee, Seung Jae Shin, Hyejin Jung, Dang Le Tri Nguyen, Si Young Lee, Woong Hee Lee, Da Hye Won, Min Gyu Kim, Hyung Suk Oh, Taehwan Jang, Hyungjun Kim, Byoung Koun Min, Yun Jeong Hwang

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


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 H2 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.

Original languageEnglish
Pages (from-to)2241-2248
Number of pages8
JournalACS Energy Letters
Issue number9
Publication statusPublished - 2019 Sept 13

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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