II. Electrochemical data Figure S3.1. Comparison of the performance for CO2 reduction with 1.5 mol% of 1-methyl-3-pentyl imidazolium (PM) and 1.5 mol% of tetrabutylammonium (TBA) cations in anhydrous acetonitrile. (a) Electrolysis with PM NTf2 at 18 mA/cm2 shows ~100 % FE for CO production at an average voltage of -2.58 V vs. Ag/Ag+. (b) Electrolysis with TBA NTf 2 at 18 mA/cm2 results in lower performance for both selectivity and productivity: H2 was the main product with an average voltage of -3.3 V vs. Ag/Ag+. Electrolysis measurements were performed over the Au foil electrode in a two-compartment cell under normal stirring conditions and applying a flow of 5 mL CO2/min. a b
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