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| Type |
Oral Presentation |
| Area |
Oral Presentation of Young Scholars in Electrochemistry |
| Room No. |
406호 |
| Time |
THU 10:00-: |
| Code |
ELEC.O-5 |
| Subject |
Stand-alone carbon dioxide reduction using copper oxide wire arrays powered by WO3/DSSC dual absorbers |
| Authors |
최승요, 박현웅1,*
경북대학교 건설환경에너지공학부, Korea
1경북대학교 에너지공학부, Korea
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| Abstract |
We have developed a tandem photoelectrochemical cell which is composed of WO3/dye-sensitized TiO2 (WO3/dye) dual absober photoandoe and copper oxide (Cu2O/CuO) wire array cathode. This tandem cell is demonstrated as a stand-alone and durable device for CO2 photoelectrochemical reduction. The Cu2O/CuO wire arrays exhibits a superior electrocatalytic activity of CO2 reduction compared to metallic Cu (Cu0). Upon irradiation of a simulated light (AM 1.5; 100 mW/cm2), the single absorber system (WO3 and Cu2O/CuO couples) shows low open circuit potential at -0.2 V (0.1 M potassium bicarbonate; pH 6.8; carbon dioxide-purged). In the dual absorber system, the long wavelength ( > 450 nm) passed through the semi-transparent WO3 film is absorbed by dye. The tandem PEC cell shows open circuit potential gain of ~0.7 V, which can drive the CO2 conversion without any external bias. The primary CO2 conversion product is CO with energy efficiency ~3.5 % while H2 and low amount of formic acid are obtained with the energy efficiencies of ~0.9 % and ~0.35 % in 5 hours, respectively. The significant low yield of formic acid is attributed to the limited availability of proton/electron pairs (H•) at less negative potentials leading to predominant CO formation, as well as at high negative potentials due to predominant H2 production. Neither CO2 conversion products nor H2 are not found in the single absorber system |
| E-mail |
csy2580@gmail.com |
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119th General Meeting of the KCS