[3F01-08] Electrode Surface Science

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[3F04] Vibrational spectroscopic study of electrochemical reduction products of CO₂ on pyridine compounds-adsorbed gold electrodes

*Mikio Ito^1,2, Hidenori Noguchi^2,3 (1. National Institute of Technology, Tokyo College, 2. National Institute for Materials Science, 3. Hokkaido University)

Au electrodes are known for high selectivity in producing CO in the CO₂ electroreduction process with a relatively low overpotential. In this study, the electroreduction of CO₂ in aqueous media on Au electrodes modified with pyridine and its derivatives were investigated using surface vibrational spectroscopy techniques such as surface-enhanced infrared reflection absorption spectroscopy (SEIRAS) and sum frequency generation (SFG) spectroscopy . In the electroreduction of CO₂ at the interface between CO₂ saturated solution containing 30 mM of pyridine and the Au electrode, less adsorbed CO, which is typically the main product of CO₂ electroreduction in pyridine free solutions, was observed. This results suggests that pyridine adsorbed on Au electrodes plays a key role in modifying the CO₂ reduction pathway, promoting formate production rather than CO. These findings have implications for designing efficient catalysts for the sustainable production of chemicals and fuels.

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