In order to test the above hypothesis, we performed additional simulations with an implicit confining wall. Here, the ion-ion and ion-water interactions are still described using a NNP, but the graphene is modeled as a smooth, uncharged surface which interacts with the electrolyte via a Lennard-Jones potential. Such a model allows us to quantify the combined impact of both graphene's lattice as well as its electronic structure. The PMF for the H = 6.70 Å system is compared for the explicit and implicit carbon models in Fig. .