Thus, the contribution originates from the electronic structure on the electrode which, for graphene, is usually limited by its low electronic density of states near the Fermi level and can be calculated using DFT and DFTB ; represents instead the contribution of the charge accumulation within the EDL at the electrode/electrolyte interface and can be calculated using MD simulations using the difference of the electrostatic potential drop ( ) between charged and neutral charged graphene case, , as follows: