Earlier studies have noticed that surfaces having stronger interactions with water also tend to have larger ∆φ . In a recent study, Cheng and co-workers found a linear correlation between experimentally measured ∆φ and the computed adsorption energy of water on a number of planar [(111), (100), (110) and (0001)] metal surfaces. In addition, they find a correlation between the computed ∆φ and the coverage of chemisorbed water obtained using AIMD simulations.