| 학회 |
한국화학공학회 |
| 학술대회 |
2017년 가을 (10/25 ~ 10/27, 대전컨벤션센터) |
| 권호 |
23권 2호, p.2125 |
| 발표분야 |
재료 |
| 제목 |
Selectivity of Photoelectrochemical CO2 Reduction Modulated with Electron Transfer from Size-Tunable CdSe Nanocrystals |
| 초록 |
We investigate the product selectivity of CO2 reduction using NiO photocathodes decorated with CdSe quantum dots (QDs) of varying size in a photoelectrochemical (PEC) cell. Size-tunable CdSe QDs enable systematic control of electron transfer kinetics from CdSe QDs to NiO. It turns out that different size of CdSe QDs results in variation in product selectivity for CO2 reduction. The energy gap between conduction band edge and redox potential of each reduction product correlates with their production rate. The size dependence of the electron transfer rate estimated from the energy gap is in agreement with the selectivity of all products from CO2 reduction but CO. The deviation in the case of CO is attributed to sequential conversion of CO into CH4 with CO absorbed on electrode surface. Based on a premise that the CdSe QDs would exhibit similar surface configuration regardless of QD size, it concludes that the electron transfer kinetics proves to alter the selectivity of CO2 reduction. |
| 저자 |
조현진, 이도창
|
| 소속 |
KAIST |
| 키워드 |
화공소재 전반 |
| E-Mail |
|
| 원문파일 |
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