Figure denotes the linear sweep voltammetry (LSV) profiles for different catholyte solutions when Ag is used as the cathode. Three electrolyte solutions are considered for the study, namely 0.1 M KHCO3, 0.1 M KNO3, and 0.1 M KHCO3 + 0.1 M KNO3. The first and the last solutions are equilibrated with CO2 before the study, whereas 0.1 M KNO3 is not equilibrated with CO2. A detailed description of the potentiostat settings used to perform LSV and other experiments in this section is given in the methods section. The possible Faradaic reactions when 0.1 M KHCO3 is used as the electrolyte are the CO2 reduction reaction (CO2RR) to CO and HER, NO3 -reduction reaction (NORR) to NO2 -, NH3, and N2 when 0.1 M KNO3 is used as the electrolyte and urea synthesis reaction (USR) along with HER, CO2RR to CO and NORR when a solution of 0.1 M KHCO3 and 0.1 M KNO3 is used as the electrolyte. The slope of the LSV profile gets steeper when the solution of 0.1 M KHCO3 and 0.1 M KNO3 is used in comparison to individual electrolyte solutions indicating possible USR. The experimentally measured onset potential for the NORR when 0.1 M KNO3 is used is 0.04 V and for the CO2RR when 0.1 M KHCO3 is used is -0.42 V. For the solution containing both 0.1 M KHCO3 and 0.1 M KNO3, the onset potential is measured to be -0.22 V. A zoomed-in figure denoting the onset potentials is provided in the supporting information (Figure ).