To quantify how these changes drive electrowetting, herein we directly calculate, using molecular dynamics, the solid/liquid surface tension ( of LiCl electrolyte solutions of different concentrations in contact with a neutral and a charged graphene sheet. To account for the polarization effect induced on the electrode surface by the presence of an external voltage and the electrolyte, we employ a novel procedure that combines the explicit polarization of the graphene electrodes, modelled at the quantum mechanical (QM) level, with the long timescale motion of the electrolytes in the solution modelled via molecular dynamics (MD). The procedure, called QM/MD, balances accuracy and computational cost and has been already used to model graphene/electrolyte interfaces and also conducting polymer solutions . The change in upon charging the graphene electrodes is calculated by integrating pressure differences along the direction perpendicular to the graphene surface ( ) between the pressure normal ( ) and that tangential ( ) to the graphene surface as obtained from the MD simulations (3)