Metal-water interfaces are pivotal for various applications in catalysis, materials science, and electrochemistry. In electrocatalysis and electrochemistry, much of the current research is aimed at understanding how the aqueous metal interfaces or electrochemical double layers affect reaction kinetics and selectivity. Given the role of the interface in determining reaction thermodynamics and kinetics of the system, it can even be said that the interface is the electrocatalyst. However, our understanding of metal-water interfaces at the atomic scale is quite limited. In addition to the many open questions regarding the influence of interfacial water and ions on (electro)chemical reactions, even the basic thermodynamic properties of the interfaces remain deficient. For instance, it is generally unknown whether the formation of the interface is primarily driven by energetic or entropic factors and how each contribution depends on the electrolyte and the electrode material. It also remains largely unknown how the interfacial structure and dynamics are linked with its thermodynamic properties. . The fundamental understanding of solid-liquid thermodynamics may have a crucial influence in the design of electrocatalytic systems, where the catalyst a) Previous affilition: Nanoscience Center, Department of Chemistry, University of Jyväskylä, P.O. Box 35 (YN), FI-40014 Jyväskylä, Finland wetting or the liquid entropy may substantially impact activity and selectivity.