Presentation Information
[3F02]Products and intermediates of capture and clectroreduction of CO2 on a lysine modified Au electrode in aqueous media probed by Surface-enhanced Infrared Reflection Absorption Spectroscopy
*Nanaki Maruyama1, Mikio Ito1,2, Hidenori Noguchi2, Momoka Toriumi1, Tomoki Watanabe1, Ryo Shouji1 (1. National Institute of Technology, Tokyo College, 2. National Institute for Materials Science)
Natural α-amino acids are a group of molecules that are extremely easy to obtain and handle, yet they have been found to possess excellent functions, such as proline, which catalyzes the aldol reaction, and lysine (Lys), which is expected to be used for CO2 absorption. In this study, Lys was immobilized on the mix SAM by applying peptide solid phase synthesis method. We used the ATR-SEIRAS measurement to confirm the progress of CO2 absorption reaction at the interface between CO2 solution and Lys modified mix SAM. Electrochemical SEIRAS measurements were also performed to detected and identified the reaction intermediates and final products of the electroreduction of CO2. In the CO2 fixation reaction, it is confirmed that Lys fixed CO2 as carbamate and hydrogen carbonate. In the CO2 electroreduction reaction, it is implied that CO2 fixed as carbamate was reduced electrochemically into formate ions at the potential range of -200 mV or more negative.