| 학회 |
한국재료학회 |
| 학술대회 |
2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 |
23권 1호 |
| 발표분야 |
4. 광전기화학반응을 통한 태양에너지 변환(Photoelectrochemical Solar Energy Conversion) |
| 제목 |
Improved Water Splitting Performance in Pulsed Laser Deposited BiVO4-WO3 Thin Film Photoanode |
| 초록 |
Energy harvest from solar light has been attracted attention since the Sun gives unlimited energy sources. Photoelectrochemical (PEC) cell is one of the techniques for the utilization of the solar radiation and has unique features that the light energy can be directly converted to chemical fuels. Among various photoelectrode materials in PEC cell, bismuth vanadate (BiVO4) is intensively investigated as photoanode because of its low bandgap energy of 2.4 eV for visible light hydrogen generation. Recently, we reported on excellent water splitting performance of high quality BiVO4 thin film grown by pulsed laser deposition (PLD). Further enhancement of device performance can be obtained by formation of heterojunction with other materials such as tungsten oxide (WO3) which has ability to suppress the carrier recombination in BiVO4 layer during operation. To realize the strategy, PLD will be one of the powerful methodologies because the heterostructure films can be easily fabricated by means of using multiple targets of BiVO4 and WO3. In this research, we have fabricated high quality BiVO4 and WO3 polycrystalline thin films as photoanodes by PLD. The grown BiVO4 have photocatalytically active phase of scheelite-monoclinic structure and show visible light absorption which were confirmed by X-ray diffraction (XRD) and UV-vis spectroscopy, respectively. The performance of the BiVO4–WO3 heterostructure grown on glass substrate covered with F-doped tin oxide (FTO) exceeds 3.0 mA/cm2 at 1.23 V versus the potential of the reversible hydrogen electrode (VRHE) under AM 1.5G illumination, which is the highest value so far in previously reported single layer of BiVO4 films grown by physical vapor deposition methods. The enhancement mechanisms of our heterostructure film will be discussed in the presentation. |
| 저자 |
Sang Yun Jeong1, Taemin Ludvic Kim2, Do Hyun Kim3, Hye-Min Shin4, Jaesun Song5, Myung-Han Yoon6, Chung Wung Bark7, Ho Won Jang1, Sanghan Lee2
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| 소속 |
1School of Materials Science and Engineering, 2Gwangju Institute of Science and Technology, 3Department of Materials Science and Engineering, 4Seoul National Univ., 5Department of Electrical Engineering, 6Gachon Univ., 7Seongnam |
| 키워드 |
bismuth vanadate; tungsten oxide; oxide photoanode; pulsed laser deposition; water splitting solar cell
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| E-Mail |
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