discuss (quantitative) differences on the basis of the role of the imidazolium cations in stimulating reduction of CO2. Results and discussion Figure 5.1 presents the results of CO2 electrolysis for five polycrystalline electrodes. The chronopotentiometry curves showing the potential vs time are depicted for 0.5 mol% 1,3dimethylimidazolium bis(trifluoromethylsulfonyl)imide (MM NTf2) in acetonitrile (MeCN), with anhydrous conditions ensured via a rigorous protocol (for further details, refer to the experimental protocols described in Chapter 2). All five metals (Ni, Cu, Au, Ag, and Zn) exhibit close to 100% Faradaic efficiency (FE) to CO. We also evaluated the performance of an Fe electrode (Supporting Information Figure S5.6). The Fe electrode is almost inactive for CO2 reduction in the imidazolium-anhydrous MeCN electrolyte, likely due to *CO poisoning of the surface103. The current observed for Fe electrodes is likely caused by reduction of acetonitrile. A LSV in a similar potential range is Figure 5.1 Electrolysis results for CO2 reduction at -1 mA/cm2 for 5 different transition metal catalysts in anhydrous acetonitrile. 0.5 mol% of MM NTf2 was used as both electrolyte and co-catalyst. Additional information regarding gas analysis and evaluation of Faradaic efficiencies can be found in Supporting Information. CO 2 reduction activity: Au>>Ag>Cu>>Zn>Ni
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