As shown in Fig. in contact with halide-containing aqueous electrolytes the explicit and also im- plicit presence of water can be safely neglected, still a semi-quantitative agreement with the experiment can be obtained . This is due to the relatively weak and rather non-directional interaction of liquid water with close-packed metal electrodes . In contrast, the interaction of water with hydroxide and oxide surfaces has a much stronger covalent character leading to a much more directional bonding of the water molecules, which then becomes significantly modified in the presence of adsorbed cations.