Having analyzed the overall transport behavior in each of our confined electrolyte systems, we now turn to characterizing how transport differs in the interfacial electrolyte layers compared to the center of the slit. The border between these regions is defined as the first minimum in the density profile for each species, as illustrated in Fig. . Fig. compares the selfdiffusion coefficient of each species of the electrolyte in the interfacial and central portions of the slit for the largest system studied herein (5 water layers, H = 17.29 Å). We observe that the water self-diffusion coefficient is 22% larger at the graphene interface than in the center of the slit, a trend that is consistent with the very low friction observed in both simulations and experiment for water/graphene interfaces. Enhanced interfacial diffusivity has been observed previously in classical force field-based simulations of water at hydrophobic interfaces and is consistent with continuum hydrodynamics-based analyses assuming perfect slip boundary conditions (infinite slip length). Based on the close agreement between the water and ion self-diffusion coefficient trends observed in Fig. , one might expect the ions to also diffuse significantly faster in the interfacial layer. However, relatively little change in the ion self-diffusion coefficients is observed: sodium ions diffuse approximately 5% slower at the interface, while interfacial chloride ions diffuse approximately 5% faster. We attribute this relative uniformity in ion diffusion coefficients across the height of the slit to a cancellation of factors. On the one hand, the interfacial ions are diffusing in a less viscous medium due to the water's larger diffusion coefficient. This effect, however, is countered by a changing interfacial diffusion mechanism. As shown in Fig. , both the sodium and chloride ions exhibit more vehicular diffusion mechanisms (longer ion-water diffusion lengths) at the interface, which is associated with slower self-diffusion.