Seminar & Colloquium
[세미나: 7월 21일(금), 오후 4시] Prof. Ji-Hyun Jang, School of Energy and Chemical Engineering, UNIST
Title
Boosting up charge transport property of hematite for an efficient water splitting system
Speaker
Prof. Ji-Hyun Jang, School of Energy and Chemical Engineering, UNIST
Career
- 2013. 8. ~ present Associate Professor, Full Professor, School of Energy and Chemical Engineering, Ulsan National Institute of Technology (UNIST)
- 2009. 8. ~ 2013. 7. Assistant Professor, Interdisciplinary School of Green Energy, Ulsan National Institute of Technology (UNIST)
- 2004. 5. ~ 2009. 5. Postdoc., Dept. of Materials Science and Engineering, Massachusetts Institute of Technology (MIT)
- 2003. 9. ~ 2004. 4. Postdoc., Dept. of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)
Education
- 2003. 8. Ph.D., Dept. of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)
- 1999. 2. M.S., Dept. of Chemistry, Korea Advanced Institute of Science and Technology (KAIST)
- 1997. 2. B.S., Dept. of Chemisty, Pusan National University
| Date | Friday, July 21st, 2023
| Time | 16:00 ~
| Venue | 33동 228호
[Abstract]
In this study, I would like to talk about how we can boost up the poor charge transport behavior of hematite for an efficient water splitting system. Hematite is a promising potoactive material because of many adavntages including low coat, water stability, and high theoritical solar to hydrogen conversion efficiency. However its intrinsic poor trasnport behaviors such as low conductivity and short hole diffusion length have been a bottle neck for wide applications of hematite as a photoanode mateiral in water splitting. In this study, I suggest a straightforward way to address intrisinc poor transport behaviors of hematite considering the overall transport process from the photoande to the co-catalyst. The low conticitivity was addressed by the creation of porous structure and efficient doping. Additionally the poor contact between the photoanode and cocatalyst was solved by the use of organic hole transport layer (HTL). The optimized prous photoanode prepared with an optimal doping conditoin and the HTL showed a maximum photocurrent density of 4.7 mA cm-2 at 1.23 VRHE due to enhanced surface reaction kinetics. This study provides a significant breakthrough in dramatically improving the low PEC performance of hematite-based photoanodes with an short-hole diffusion lenght issue through optimal co-doping and nanostructuring.
| Host | 장호원 교수(02-880-1720)