| 학회 |
한국재료학회 |
| 학술대회 |
2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 |
24권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Unassisted visible solar water splitting with efficient photoelectrodes sensitized by quantum dots synthesized via an environmentally friendly and efficient eutectic solvent-mediated approach |
| 초록 |
Deep eutectic solvents (DESs) based on choline chloride/ethylene glycol have been explored as synthetic media for recently introduced Cu-Sb-S based colloidal quantum dots (CQDs) decorated on NiO/fluorine-doped tin oxide (FTO) and TiO2/FTO photoelectrodes for unassisted solar water splitting for hydrogen generation earliest in order. The feasibility of the use of an environmentally benign solvent-based synthetic process is demonstrated herein by preparing the earth-abundant Cu-Sb-S-based CQDs and utilizing them in a solar energy harvesting material for photoelectrochemical (PEC) water splitting while avoiding the use of sacrificial agents. The band alignment between CQD and NiO or TiO2 clearly suggests that the CQD-modified NiO and TiO2 electrodes act as a potential photocathode (NiO/Cu3SbS4/ZnS) and photoanode (TiO2/CuSbS2/ZnS) with Faradaic efficiencies of up to 74 and 86% respectively, which allows us to construct an efficient PEC cell to split water at an overall solar-to-hydrogen (STH) efficiency of ~ 0.28%. The tandem photoelectrode configuration in an unassisted mode of solar-driven water splitting based on a wire-linked tandem system shows ~ 0.97 mA/cm2 of current density, which can split water under zero-bias conditions. Enhancement of the PEC device by accelerating electron and hole transport and broadening the diffusion length using photosensitizer materials while avoiding typical recombination with a thin passivation layer was achieved. The charge transport mechanism through combining experimental results in half and overall water splitting reactions is proposed. The success of such efficient multi-layered heterojunction photoelectrodes is essential for the future development of green energy harvesting devices. |
| 저자 |
Uma V. Ghorpade, 김진혁
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| 소속 |
전남대 |
| 키워드 |
<P>Ethaline; Water splitting; photocathode; photoanode</P>
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| E-Mail |
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