To evaluate the stability of the system in terms of operating potential and overall cell performance, long-term experiments were conducted over a total duration of 94 hours, including 47 hours of cumulative working time. The system operated under a cyclic chronopotentiometric mode, alternating between a working current density of -5 mA/cm² and a resting current density of 0 mA/cm², each for 1 minute. The cell exhibited smooth operation with stable potential values throughout, demonstrating the robustness and stability of the setup as shown in Figure . It should be noted, however, that this experiment was not designed to evaluate the stability of ammonia synthesis due to the membrane-less configuration of the cell. In such a setup, synthesized ammonia may be oxidized during extended periods of operation. The NMR quantification revealed the FE to be approximately 16%, which was half of what we observed during the 1-hour working time. This supports the claim that ammonia undergoes oxidation in the membrane-less setup.