| 학회 |
한국재료학회 |
| 학술대회 |
2015년 봄 (05/14 ~ 05/15, 구미코) |
| 권호 |
21권 1호 |
| 발표분야 |
C. 에너지 재료 |
| 제목 |
Efficient Photoelectrochemical Hydrogen Production from BiVO4-decorated WO3 Helix Nanostructures |
| 초록 |
Photoelectrochemical (PEC) water splitting has attracted considerable attention because it is a very promising and clean technique to produce carbon-free hydrogen from inexhaustible solar energy and water resource. PEC water splitting is a process in which electrons and holes are generated in the semiconductor photoanode by solar irradiation to produce both H2 gas and O2 gas from water. Therefore, both optical and electrical properties of semiconductor photoanode strongly affect the solar-to-hydrogen efficiency for PEC cells. In this study, we present a new type of photoanode consisting of an array of WO3 nanohelixes for much more efficient solar hydrogen production. The unique geometry of the vertically aligned WO3 nanohelixes array, fabricated by a facile and cost-effective method called oblique angle deposition, causes a strong scattering of solar radiation and better light harvesting to improve optical properties of the photoanode. In addition, a radius of nanohelix which is comparable to hole diffusion length of WO3 as well as near single crsytallinity shown by selected area diffraction pattern and transmission electron microscopy cause efficient charge separation and transport to improve electrical properties. Hydrogen ions and electrons are effectively made from water by large surface area of nanohelixes array. Based on these enhanced optical and electrical properties of WO3 nanohelixes array, BiVO4-decorated WO3 nanohelixes array photoanode shows excellent PEC performance; maximum photocurrent density 5.35mAcm-2 is achieved with FeOOH/NiOOH co-catalysts at 1.23V versus the reversible hydrogen electrode, to the best of our knowledge. |
| 저자 |
Il Yong Choi1, Xinjian Shi2, Kan Zhang2, Jeong Kwon2, Dong Yeong Kim1, Ja Kyung Lee1, Sang Ho Oh1, Jong Hyeok Park2, Jong Kyu Kim1
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| 소속 |
1POSTECH, 2Sungkyunkwan Univ. |
| 키워드 |
<P>Photoelectrochemical hydrogen production; Photoelectrochemical water splitting; Nanostructured photoanodes; WO<SUB>3</SUB>; BiVO<SUB>4</SUB>; Helix nanostructures</P>
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| E-Mail |
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