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124th General Meeting of Korean Chemical Society Mixed Copper States in Anodized Cu Electrocatalyst for Stable and Selective Ethylene Production from CO2 Reduction

Submission Date :
9 / 20 / 2019 , 11 : 51 : 01
Abstract Number :
Presenting Type:
Oral Presentation
Presenting Area :
KCS - Oral Presentation for 2019 DOW Korea Award
Authors :
Si Young Lee, Yun Jeong Hwang*
Division of Energy and Environmental Technology, KIST School, Korea
Assigned Code :
KCS.O-9 Assigend Code Guideline
Presenting Time :
THU, 10 : 49
Recently, in electrochemical CO2 reduction studies, copper catalysts have been noted as major studies because they could form C-C bonds. To promote the formation of this C-C bond, researchers changed the shape of the copper catalyst surface to induce local pH changes, or to introduce copper oxide as a catalyst. However, in copper oxide-based catalysts not only complexly synthesizes the catalyst, it is not clear why the oxide catalyst shows better C-C coupling performance. Therefore, in this study, a simple anodization method was introduced to synthesize the catalyst in the Cu(OH)2 state. This catalyst was distinguished from the Cu2O or CuO present in the traditional native oxide layer, and showed a 40% ethylene selectivity, which was twice as good as copper foil, stable for 40 hours. On the other hand, uniquely selectivity of CH4 increased slightly over time in the long-term bulk electrolysis. This means that the C1/C2 generation ratio changes with changes in surface conditions of Cu(OH)2 catalyst. Therefore, we introduced pre-treatment process, which is high negative potential reduction and low negative potential reduction to adjust the Cu2+/Cu+/Cu0 ratio of the surface. At this time we observed that while ethylene production was stable for a long time for samples with a high ratio of Cu2+, samples with missing Cu2+ decreased ethylene production and increased methane production rapidly within hours. Not only could the cause of C-C bond formation of copper catalyst be identified through this study, it could present a new strategy to maintain stability in oxide-derived copper catalyst in the future.