| 학회 |
한국재료학회 |
| 학술대회 |
2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 |
23권 1호 |
| 발표분야 |
8. 태양광 물분해 광전극 및 광촉매(Photoelectrode and photocatalyst materials for solar water splitting) |
| 제목 |
Highly enhanced photocatalytic properties of domain-engineered ferroelectric BiFeO3 thin film photoanodes |
| 초록 |
In photoelectrochemical (PEC) water splitting, charge separation and collection by the electric field is the one of the most important factors to improve the conversion efficiency. Hence, ferroelectric oxides are considered as promising photoanode materials in the way that high built-in-potential due to the spontaneous polarizations can largely enhance the separation and drift of photo-generated carriers. Here, we investigate PEC properties of bismuth ferrite (BiFeO3) thin film photoanodes with different crystallographic orientations and consequent ferroelectric domain structures. As the crystallographic orientation changes from (001)pc via (110)pc to (111)pc, ferroelastic domains in epitaxial BiFeO3 thin films become mono-variant and the spontaneous polarization increases up 110 μC/cm2. As a result, the photocurrent density at 0 V vs. Ag/AgCl increases by approximately 5.3 times and the onset potential decreases by 0.180 V in the downward polarization states. We further demonstrate that ferroelectric switching in the (111)pc BiFeO3 thin film photoanode leads to approximately 8,000% change in the photocurrent density and 0.330 V shift in the onset potential. Our study strongly suggests that domain-engineered ferroelectric material can be used as an effective charge separation and collection layer for efficient solar water splitting photoanodes. |
| 저자 |
Jaesun Song1, Taemin Ludvic Kim2, Jaeseong Cha1, Sam Yeon Cho3, Jongmin Lee1, Sang Yun Jeong1, Hyunji An1, Wan Sik Kim1, Ji Young Jo1, Sang Don Bu3, Ho Won Jang2, Sanghan Lee1
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| 소속 |
1Gwangju Institute of Science and Technology (GIST), 2Seoul National Univ., 3Chonbuk National Univ. |
| 키워드 |
BiFeO<SUB>3</SUB>; photoelectrochemical; ferroelectric; domain; orientation; Pulsed laser deposition
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| E-Mail |
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