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09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Mixed Copper States in Anodized Cu Electrocatalyst for Stable and Selective Ethylene Production from CO
2019년 9월 20일 11시 51분 01초
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목 10시 : 49분
Oral Presentation for 2019 DOW Korea Award
Si Young Lee
, Yun Jeong Hwang
Division of Energy and Environmental Technology, KIST School, Korea
Recently, in electrochemical CO
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)
state. This catalyst was distinguished from the Cu
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
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)
catalyst. Therefore, we introduced pre-treatment process, which is high negative potential reduction and low negative potential reduction to adjust the Cu
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
, samples with missing Cu
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.
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