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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photoelectrochemical CO2 Reduction into Liquid Products: Multi-electron Shuttling, Reduction Potential Tuning and CO2 Activation

등록일
2019년 8월 27일 15시 56분 13초
접수번호
1648
발표코드
ELEC1-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 15시 : 40분
발표형식
심포지엄
발표분야
Electrochemistry - In operando? Emerging Techniques for Electrocatalysis
저자 및
공동저자
Young Soo Kang
Department of Chemistry, Sogang University, Korea
CO2 reduction driven by(040)-facet engineered BiVO4 plate photoanode(040)-BVO) is investigated for solar fuel production. In the photoelectrochemical CO2 reduction reaction, water oxidation reaction is performed on (040)-BVO and chemical fuels is obtained on Cu cathode in the CO2-saturated NaCl electrolyte under AM 1.5 G. C1 chemical fuel is evolved through reduction potential depending multistep process from CO2 molecule. 040-BVO(photoanode)/NaCl(electrolyte)/Cu(cathode) system is illuminated with solar light under the external bias that is tailored to reduce CO2 via reduction potential tuning. Integrating applied bias potential into conduction band minimum of 040-BVO enables CO2 molecules to be converted into valuable chemical fuels. This thermodynamic control leads to the product selectivity and an increase in the faradaic efficiency. We observe that the selectivity and yield of the products depend on CO2 reduction potential tuning. With water oxidation reaction of 040-BVO photoanode which has 42.1% of the absorbed photon-to-current conversion efficiency at 1.23 V (vs RHE), chemical products were observed as faradaic efficiency of 30% formic acid, 60% formaldehyde, 12% MeOH and 3% EtOH by reduction potential tuning. For this study, the correlation between the production of solar chemical fuels and CO2 reduction potential tuning via external bias potential on 040-BVO photoanode/Cu photocathode is systematically investigated, and we suggest that the results of this study represent the most viable strategy.

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