Apr 24, 2024
10:30am - 11:00am
Room 337, Level 3, Summit
Heng-Liang Wu1,2
National Taiwan University1,National Synchrotron Radiation Research Center2
The solid-liquid interfacial reactions play a crucial role in controlling the performance and stability of electrocatalysts
1-4. In situ vibrational spectroscopy techniques such as Raman and surface-enhanced infrared absorption spectroscopy (SEIRAS) are the powerful tools for examining the surface-adsorbed intermediates on the solid-liquid interfaces. In this talk, we report on our use of in situ SEIRAS, Raman, and X-ray absorption spectroscopy to investigate the electrochemical CO
2 reduction mechanism over the Cu-based electrocatalysts. The Cu-based electrodes with different oxidation states result in the formation of various CO intermediates such as CO
atop and CO
bridge. The co-existence of CO
atop and CO
bridge corresponds to the selectivity of CO
2-to-C
2H
4 reaction. Also, the bimetallic electrocatalysts are developed for efficient CO
2-to-HCOOH and CO
2-to-CO conversion processes. We found that the surface-adsorbed COO species with different binding structures play crucial role in the reduction process. The electronic structures of Cu-based electrocatalysts are associated with the formation of surface-adsorbed intermediates and electrocatalytic properties. The formation of surface-adsorbed intermediates and reaction mechanism associated with CO
2-to-HCOOH and CO
2-to-CO reactions over the bimetallic electrocatalysts will be discussed in detail.
References
[1] T. Cheng, H. Xiao, W. A. Goddard,
J. Am. Chem. Soc., 138, 13802 (2016).
[2] T.-C. Chou, C.-C. Chang, H.-L. Yu, W.-Y. Yu, C.-L. Dong, J. Velasco-Vélez, C.-H. Chuang, L.-C. Chen, J.-F. Lee, J.-M. Chen, and H.-L. Wu,
J. Am. Chem. Soc., 142, 2857 (2020).
[3] X. Mo, X. Gao, A. V. Gillado, H.-Y. Chen, Y. Chen, Z. Guo, H.-L. Wu, E. C. M. Tse,
ACS Nano, 16 12202 (2022).
[4] K. B. Ibrahim, T. A. Shifa, M. Bordin, E. Moretti, H.-L. Wu, A. Vomiero,
Small Methods, 2300348 (2023).