is exactly what we have seen for the case of Au(100) (Fig. ). The corresponding oxygen and hydrogen density distributions confirming this point are shown in Figures S7 in the Supporting Information. The charge inversion with adsorbed Cl -is expected to increase significantly the interfacial capacitance, as reported from the cyclic voltammetry. This signifies the ability of finite-field DFTMD to simultaneously control the free charge via the electric displacement D and dynamically include the ionic charge due to surface chemistry.