Hydrohalic acid anion interaction with silver surfaces: Ag(100) – chloride
In this chapter the experimental results on adsorption of chloride on Ag(100) surface is described.
The onset of chloride adsorption on Ag(100) in 0.02 M KCl + 0.03 M KClO4 solution is characterized by an initial broad CV peak (from about −1.1 to about −1.0 V (SCE = saturated calomel electrode)) corresponding to a lattice gas phase. A sharp peak at −0.63 V (SCE) indicates the onset of an ongoing transformation of the lattice gas into an ordered c(2 × 2) structure. Like in UHV the anions reside in fourfold hollow sites. The c(2 × 2) phase is stable until at potentials E > −0.20 V (SCE) complex AgClx surface compounds are formed. Long-range interactions are dominated by electrostatic dipole-dipole interactions between the electrosorbedCl anions (Cl is the most electronegative among the three halides Cl, Br, I.) [1, 2, 3, 4].
saturated calomel electrode