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현재 가능한 작업은 아래와 같습니다.
09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
124th General Meeting of Korean Chemical Society
Mixed Copper States in Anodized Cu Electrocatalyst for Stable and Selective Ethylene Production from CO
2
Reduction
Submission Date :
9 / 20 / 2019 , 11 : 51 : 01
Abstract Number :
124092032067
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 CO
2
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 Cu
2
O 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 CH
4
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 Cu
2+
/Cu
+
/Cu
0
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 Cu
2+
, samples with missing Cu
2+
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.