| 학회 | 한국재료학회 |
| 학술대회 | 2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 | 23권 1호 |
| 발표분야 | 5. 나노공정과 메타물질(Nano-fabrication and meta-materials) |
| 제목 | 나노임프린트를 이용한 WO3 계층적 나노구조 제조 및 이를 이용한 광전극 |
| 초록 | Recently, solar energy has a lot of attention in the fields of sciences and industries as potentially alternative energy, which has some advantages such as cleanness, safety, and unlimited amount. Photoelectrochemical water splitting is one of the most promising solar energy conversion technologies, which solar energy is possible to be converted as hydrogen energy. In order to solar-to-hydrogen conversion, specialized semiconductors are needed to absorb sunlight and make some photoelectrochemical reactions. Many metal-oxide semiconductor including TiO2, Fe2O3, WO3, and BiVO4, have adaptable electronic properties. Especially, TiO2 has been considered one of the most promising materials for photoelectrochemical water splitting due to its relatively low cost, photostability, and non-toxicity. However, the photoelectrochemical water splitting of TiO2 has some limitation because TiO2 can only absorb ultra-violet light according to their electronic band gap, which accounts for only 4% of the incoming solar energy. In this study, we fabricated hierarchical WO3 photoanode using nanoimprinting of WO3 nanoparticle (NP) dispersed resin and subsequent solvothermal growth. First, WO3 NP dispersed resin is synthesized using WO3 NP solution, monomer, and thermal-initiator. Then, WO3 microstructure is formed on transparent conducting layer using nanoimprinting of WO3 NP dispersed resin. Subsequently, WO3 microstructure is sintered at high temperature. Finally, WO3 nanoflakes are grown on WO3 microstructure in order to fabricate hierarchical sturcuture. Optical properties of hierarchical WO3 photoanode are characterized using UV-Visible spectroscopy. In addition, photocurrent and external quantum efficiency of hierarchical WO3 photoanode are measured using solar simulator and incident photon-to-current efficiency measurement. Finally, the structures were applied in the solar cell and photoelectrochemical cell as photoanode. Thus, efficiency of solar energy conversion is drastically increased due to their improved optical properties. |
| 저자 | 이헌 |
| 소속 | 고려대 |
| 키워드 | <P>Photoanode; WO<SUB>3</SUB>; Hierarchical structure; Nanoimprint</P> |
