In metal nitride-mediated ammonia synthesis, the SEI plays a pivotal role in determining system performance. The selection of salt, solvent, and alcohol profoundly influences the composition and stability of the SEI, thereby affecting the FE of ammonia production. In lithium-mediated systems, salts such as LiBF4 , LiClO4, and imide-based salts have been effectively utilized, underscoring the critical impact of salt selection on SEI characteristics and its subsequent effect on system stability and ammonia selectivity. The choice of magnesium salt was influenced by three key factors: solubility, conductivity, and SEI stability. Magnesium perchlorate was selected due to its high solubility in organic solvents like propylene carbonate and DMF, as well as its availability in anhydrous form. Its intermediate-sized perchlorate anion provided a balance between ionic conductivity and SEI stability, addressing the trade-off between these two properties. This combination ensured effective electrochemical performance with minimal iR losses and sufficient SEI stability for ammonia synthesis. The propylene carbonate system exhibited higher viscosity, leading to increased resistance and, consequently, reduced efficiency. A brief experimental protocol for the propylene carbonate system is provided in the SI. The system was tested at current densities of -2 mA/cm² and -30 mA/cm², but NMR analysis of the post-electrolysis samples showed no ammonia formation. Additionally, the voltage requirements for this system were extremely high, making it unsustainable for further investigation. The voltage and current data are included in Figure of the SI. The electrolyte comprised of 0.5M Magnesium perchlorate dissolved in DMF along with 0.065M EtOH. We implemented a current switching strategy following Andersen et al.'s recommendation , with 1 minutes of working time and 1-6 minutes of resting time (depending in the applied CD) to stabilize the SEI. The duration of the resting time varied and was adjusted as needed to maintain system stability, resulting in variable total runtimes for each current density. The resting current density was maintained at 0 mA/cm 2 (i.e., at open circuit voltage), while different working current densities were applied. Representative Chronopotentiometry for one applied current density of -10 mA/cm 2 is shown in Figure . Although this shows a zoomed in version to give a clear idea and visual representation of how current and potential values vary, the full graph is given in Si in Figure . The switching time is crucial for stabilizing cell voltage by limiting the growth of the SEI and preserving its stability. During the working time, when negative current density is applied, Mg deposition primarily occurs. The rate-limiting steps during this phase include Mg nitridation, Mg3N2 protolysis, and Mg protolysis . Conversely, during the resting time, when the current density is zero, Mg deposition ceases, and thermochemical nitridation and protolysis steps become dominant. The extent of Mg nitridation is contingent upon the N2 pressure, while Mg3N2 protolysis and Mg protolysis are influenced by the concentration of the proton donor, ethanol. In our prior work on Li mediated ammonia synthesis we observed that there are two distinct regimes: a proton-limited regime and an N2 mass transfer-limited regime. When operating at lower nitrogen pressures, N2 availability is relatively low, whereas protons are abundant in the solution. According to the hypothesized mechanism, under these conditions, N2 mass transfer controls the rate of ammonia production. Conversely, at higher pressures, where N2 is abundant for nitridation but the same amount of proton donor is used, protonation becomes the limiting factor for ammonia production. The reaction appears to proceed through two interconnected cycles: the nitridation loop and the protonation loop. Optimizing the frequency of these loops is critical for achieving the highest ammonia selectivity.