Prof. Dr. Tae Wu Kim, Mokpo National University
Title: Deciphering excited-state dynamics of photocatalysts by using time-resolved optical and X-ray spectroscopies
Speaker: Prof. Dr. Tae Wu Kim, Mokpo National University, Republic of Korea
Time: Dec. 17, 2022, 18:00-19:00
Tencent Meeting: 924-963-728
Characterizing the behaviors of photo-induced charge carriers during the photocatalytic reaction is essential to design the next-generation photocatalysts involving the efficient solar-energy conversion. Time-resolved optical spectroscopy based on transient absorption spectroscopy (OTA) is pertinent to track the excited-state dynamics of the artificially photocatalysts in the real-time manner. Such a time-resolved spectroscopy can be applied to the X-ray absorption spectroscopy (XTA), which is a complementary method to the optical spectroscopy. The combination of XTA and OTA enables us to understand the detailed excited-state dynamics of organic/inorganic photocatalysts in views of real-time structural and electronic motions. In this talk, we will introduce the showcase studies for the excited-state dynamics of various photocatalysts based on the time-resolved optical and X-ray spectroscopies. [1-3] In addition, we will show the experimental progress about the studies of in-situation reaction dynamics in the artificial photosynthesis in our lab. [4]
References
[1] Kim, T. W.; Jun, S.; Ha, Y.; Yadav, R. K.; Kumar, A.; Yoo, C-Y.; Lim, H-K.; Kim, H.; Kim, J.; Baeg, JO.; Ihee, H. Ultrafast charge transfer coupled with lattice phonons in two-dimensional covalent organic frameworks, Nature Commun. 2019, 10, 1873
[2] Kim, T. W.; Kim, P.; Mills, A. W.; Chakraborty, A.; Kromer, S.; Valentine, A. J. S.; Castellano, F. N.; Li, X.; Chen, L. X. Ligand structure dependent coherent vibrational wavepacket dynamics in pyrazolatebridged Pt(II) dimers. J. Phys. Chem. C 2022, 126, 11487-11497
[3] Mara, M. W.; Phelan, B. T.; Xie, Z-L.; Kim, T. W.; Hsu, D. J.; Liu, X.; Valentine, A. J. S.; Kim, P.; Li, X.; Adachi, S-i.; Katayama, T.; Mulfort, K. L.; Chen, L. X. Unveiling ultrafast dynamics in bridged bimetallic complexes using optical and X-ray transient absorption spectroscopies. Chem. Sci. 2022, 13, 1715-1724
[4] Singh, P.; Yadav, R. K.; Kumar, K.; Lee, Y.; Gupta, A. K.; Kumar, K.; Yadav, B. C.; Singh, S. N.; Dwivedi, D. K.; Nam, S-H.; Singh, A. P.; Kim, T. W. Eosin-Y and sulfur-codoped g-C3N4 composite for photocatalytic applications: regeneration of NADH/NADPH and oxidation of sulfide to sulfoxide, Catal. Sci. Technol., 2021, 11, 6401–6410
About the Speaker
Dr. Tae Wu Kim is an assistant professor at the Department of Chemistry, Mokpo National University, South Korea. He received his Ph.D. in the major of physical chemistry from Korea Advanced Institute of Science and Technology (KAIST). He worked as a postdoctoral fellow at the Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), South Korea. After that, he joined Argonne National Laboratory, USA as a postdoctoral fellow jointly affiliated with the Department of Chemistry, Northwestern University. His research is focusing on the reaction dynamics studies for various natural/artificial photocatalysts by using time-resolved optical and X-ray spectroscopies.
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