The Staircase Potential Electrochemical Impedance Spectroscopy (SPEIS) technique was employed to investigate the impedance behavior at the electrode-electrolyte interface under both "open" and "blocked" polarization (Figure ). When SPEIS measurements were performed under "open" polarization (Figure ), a gradual decrease in charge transfer resistance is observed with a voltage increase (more negative voltage) as indicated by the smaller semi-circle at high frequencies. The resistance reaches a minimum value at -1 V. In contrast, under "blocked" polarization (Figure ), the internal resistance remained nearly constant with no significant changes. This behavior is attributed to the rapid EDL formation, as no significant electrochemical reactions occur. When the WE is positively polarized, overpolarization primarily occurs to balance the charge of the CE without initiating any reaction. These observations are further supported by the Bode plots (Figures ). Under "open" polarization, the total system resistance progressively decreases with the voltage (more negative values). Initially, the impedance shows a significant change up to -0.5 V, after which the variations become less pronounced due to the onset of the intercalation and redox reaction at this potential, confirming the Nyquist plot results. Conversely, under "blocked" polarization (Figure ), the total impedance remains relatively unchanged across the applied voltage range. Furthermore, the phase shift observed in the Bode plot distinguishes the capacitive nature of the electrode surface (Figure ). Under gradual "open" polarization (Figure ), the EDL mechanism initially dominates, with the phase shift reaching approximately 80.75° at 6.31