These spectra recorded in an Ar atmosphere were utilized to obtain time-independent spectra in the presence of CO2 and using an electrochemical potential, and to study interfacial phenomena under a CO2 atmosphere. The ATR-FTIR spectra recorded under CO2 purge are depicted in Figure 6.2. Formation of CO and (bi)carbonate To ensure accurate peak assignment, we conducted electrolysis experiments at a constant potential of -2.25 V (versus Fc/Fc+) to assess the distribution of products. A faradaic efficiency of up to 85% was achieved for CO production. In addition to CO, we observed the production of a white solid product at a range of 10-11%. This product was subsequently dissolved in deuterated DMSO and subjected to 13C and 1H NMR analysis. Using NMR analysis and comparison with various as-synthesized salts, we established the formation of the bicarbonate Figure 6.2. ATR-FTIR spectra of Au thin film electrode in 0.1 Molar of BMMIM NTf2 in anhydrous MeCN under CO2 purging. Spectra were collected at a constant negative potential of -2.25 V vs. Fc/Fc+. Spectra are displayed relative to a time-independent background spectrum taken under Ar purging. 2250 2341 1732 1664 2100 1636 1560 1445 1330 1265 2280/90 2850 2919 2950
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