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제125회 대한화학회 학술발표회 및 총회 Electrodeposited Cu-Ag-Hg Multimetallic Thin Films for Improved CO2 Conversion: Dramatic Impact of Hg Incorporation on Product Selectivity

등록일
2020년 2월 6일 11시 04분 26초
접수번호
0726
발표코드
ELEC.P-908 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
온라인 PDF 제출
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Jooyeon Kim, Hyun Seo Ahn*
Department of Chemistry, Yonsei University, Korea
The CO2 reduction reaction (CO2RR) remains as a lofty hurdle in the overall solar to fuel process. A key research direction for CO2RR is tuning of the product selectivity to desired fuels while suppressing the undesired hydrogen evolving side reaction. In this work, we employed a CuAgHg multimetallic thin film catalyst for CO2RR. By incorporation of Hg atoms we attempted to minimize the surface adsorbed hydrogen atoms during CO2RR, thereby minimizing hydrogen evolution. In-situ electrochemical surface interrogation along with vibrational spectroscopy revealed Hg incorporation led to significantly suppressed surface adsorption of hydrogen atoms, as well as strengthened the surface binding of intermediate CO, which is in competitive binding with protons. The two effects combined led to an ethanol-selective CO2RR catalyst; with the optimum composition, the CuAgHg electrode produced 32 % ethanol and 41 % C2 (ethanol + ethylene) products, comparable to that of the best catalysts reported. Remarkably, this catalysis was possible holding the hydrogen evolving side reaction to mere 10 % and achieving 100 % overall Faradaic efficiency.

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