Figure 3.1. The co-catalytic activity of imidazolium cation for electrochemical CO2 reduction in acetonitrile (<50 ppm water). (a) LSV with 0.5 mol% of 1,3-dimethyl imidazolium MM NTf2: under He (red) and CO2 (black) atmosphere in quiescent solution. (b) LSVs for Au disk electrode in CO2 saturated acetonitrile with 0.5 mol% of MM NTf2 (blue), TEA NTf2 (red) and Cs+ NTf 2 (black) electrolyte. (c) LSVs with 0.5 mol% of MM NTf2 with rotating Au disk electrode at 2000 rpm. Red was recorded with 7% CO2 partial pressure. Black was recorded with CO2 saturated acetonitrile. (d) The zoomed-in potential region from c to highlight the onset potential under CO2 purging. (e) Chronopotentiometry at -10 mA/cm2 and constant CO production with 0.5 mol % MM NTf2 under 5 ml/min CO2 purging [1.2 bars] and normal stirring conditions using an Au foil electrode (blue), the potential remains stable during electrolysis and Faradaic efficiency for CO was 100%. f, CO (ppm) level in GC after switching the flow from CO2 to He. WE potential increases with switching flow to He which shows a higher overpotential for the same current density in the absence of CO2 as the reactant. a e c b d f
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