Double Layer Simulation Studies in Ultrahigh Vacuum of Anion and Cation Hydration at Metal Surfaces

Abstract

Abstract Using low energy electron diffraction (LEED), thermal desorption spectroscopy (TDS) and measurements of work function changes (Δø), the coadsorption of water and ions on metal surfaces has been studied in ultrahigh vacuum. As an example of anion specific adsorption, the hydration of bromide on Cu(110) has been characterized with regards to inner layer composition, surface hydration number and the formation of long‐range order. Simulation of non‐specific adsorption of lithium ions has also been attempted. On Ag(110), a drastic reduction of the binding energy of lithium in the presence of water is attributed to this type of surface hydration. Such evidence is not observed on Cu(111), where substantial fragmentation of the water seems to occur. The electrochemical relevance of these results is discussed.