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| Type |
Symposium |
| Area |
Current Trends in Energy Nanomaterials |
| Room No. |
Room 214 |
| Time |
FRI 15:30-: |
| Code |
MAT2-4 |
| Subject |
Domain- and template-engineered oxide epitaxial thin films as photoanodes for solar water splitting |
| Authors |
Sanghan Lee
School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Korea |
| Abstract |
Recently, complex oxides epitaxial thin films have gained much attention due to their novel properties as a photoelectrode for hydrogen production via solar water splitting. We present two fundamental studies about BiFeO3 and BiVO4 which are well known as a promising photoanode. First topic is about domain-engineered BiFeO3. BiFeO3 has different spontaneous polarizations and ferroelectric domain structure depending on the crystallographic orientations, so it is of great significance to clarify the direct relationship between photocatalytic properties, spontaneous polarizations and ferroelectric domain structures. Considering the above, we revealed the most enhanced photocatalytic performances of BiFeO3 could be shown in the (111)pc BiFeO3, due to its high spontaneous polarization and mono-variant domain structure. Furthermore, ferroelectric polarization switching in the (111)pc BiFeO3 caused an approximate change of 8,000% in the photocurrent density. Second topic is about template-engineered BiVO4 epitaxial thin films. It is necessary to demonstrate high quality epitaxial films to explore their fundamental properties. In this study, the growth of epitaxial BiVO4 is investigated using a thin γ-WO3 template layer. Consequently, the photocurrent density of epitaxial BiVO4 on the γ-WO3 template layer is approximately 10 times greater than that of bare BiVO4, related to the effective charge transfer by the γ-WO3 intermediate layers. |
| E-mail |
sanghan@gist.ac.kr |
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120th General Meeting of the KCS