The green and yellow lines in Fig. represent the average z-component of the electric field acting on Na + and Cl -as calculated directly from MD simulation data. The physical implications of these plots are that a cation species experiences increasingly positive fields and a negative species experiences increasingly negative fields as it approaches the interface from the bulk. These fields are large in magnitude relative to those predicted by Gouy-Chapman theory. Surprisingly, they are both repulsive, implying that the electrostatic environment of the electrode interface has the net effect of repelling both the anionic and cationic species. The negative electrode is similarly repulsive to both species. The repulsion manifests despite the presence of image charge interactions, which are attractive and fully captured by our model. Clearly, the operational electrostatic forces at the interface are species-specific. This phenomenology can not be represented by a single universal interfacial electric field (or potential) profile.