Fig. 4: Effect of the applied potential on the Amine–CO2 reduction and its interaction with the electrode surface. | Nature Communications

Fig. 4: Effect of the applied potential on the Amine–CO2 reduction and its interaction with the electrode surface.

From: Investigating proton shuttling and electrochemical mechanisms of amines in integrated CO2 capture and utilization

Fig. 4

In situ FTIR spectra performed during an electrochemical sweep from −1.0 V to −1.8 V vs. Ag/AgCl (from blue to pink) on a Cu electrode with A free CO2, B MEA−CO2, C AMP−CO2, and their reference spectra as inset. In situ FTIR spectra performed during an electrochemical sweep from −1.6 V to −2.5 V vs. Ag/AgCl (from blue to pink) on a Pb electrode with D free CO2, E MEA−CO2, F AMP−CO2, and their reference spectra as inset. The experiment was performed in sat. TEACl in sulfolane at the indicated applied potentials and a reference spectrum was taken at −1.0 V or −1.6 V vs. Ag/AgCl for Cu and Pb, respectively. Schematic view of postulated interactions on the Cu and Pb electrode surface for G free CO2, H MEA−CO2, and I AMP−CO2. MEA= monoethanolamine, AMP = 2-amino-2-methyl-1-propanol. Spectra were collected in duplicate for comparison. Source data are provided as a Source Data file.

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