Figure models the impact of the mobility saturation on the impedance response for ions of the same hydration shell size. While this parameter is closely related to ion size, it is also affected by ion-solvent and ion-ion interactions. By varying this parameter, the steady-state properties remain unchanged, as the collision parameter influences only the dynamic impedance behavior. Therefore, at low frequencies, the impedance response is unaffected by, as this regime primarily reflects the properties of the Helmholtz and compact layers. However, the effect of it becomes evident during the transition from capacitive to resistive behavior, where it influences the time constants in the diffusion region. In the high-frequency regime, again mobility saturation has no impact on the resistive part of the impedance, as this region is dominated by bulk properties. Empirical results for P b(N O 3 ) 2 , Cd(N O 3 ) 2 and Zn(N O 3 ) 2 , provided in figure 3c&d support these findings. Despite their close ionic radii, lead, zinc and cadmium exhibit distinct impedance behaviors. This difference cannot be attributed to mobility µ alone, as the bulk layer impedance (high-frequency regime) is identical for the ions. Additionally, it is not due to ion adsorption or ion-electrode interactions, since the low-frequency impedance (Helmholtz and compact layers) is also similar.