In the system of pure water shown in Figure , b, it is observed that upon charging the electrode negatively, the water molecules get closer to the electrode surface compared to the neutral case, while no changes in the water density profile is observed when the electrode is positively charged. This difference is due to different water orientation towards the surface occurring upon surface charging. In the positively charged cases, the water molecules are always oriented with the oxygen atom facing the surface, while as the potential is switched to negative the water molecules flip and the hydrogen atoms face the surface instead (Figure ). Thus, the additional peak closer to the graphene shown in the density profile of Figure on the cathode (i.e., negatively charged graphene), corresponds to the hydrogen atoms (Figure in the SI). It is interesting to notice that this flip in orientation occurs also in the LiCl solutions for all concentrations (Figure ). Similar layering of water, which survives also at high concentration of salt , has been observed also in charged pores and has been associated with a change in surface wettability . Simulations have shown that when an externally applied electric field forces the alignment of the water molecules with the oxygen atoms facing the surface, its wettability is strongly enhanced. In line with these results, as we present later, our simulations indicate that positively charged graphene surfaces wetted by water are more hydrophilic than negative and neutral ones.