Abstract
The adsoprtion of Cl − on a Cu(111) electrode surface in acidic chloride solutions was studied in situ by cyclic voltammetry and scanning tunneling microscopy (STM) and ex situ by ultrahigh vacuum based spectroscopies. The voltammogram shows adsorption and desorption peaks superimposed by the hydrogen evolution current. By a combination of X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy and low energy ion scattering spectroscopy the adsorbate was unambiguously identified as Cl −. The presence of the hydrogen evolution current induces changes of the interface composition after the emersion, obfuscating the potential dependence of the Cl coverage in the ex situ experiments. This problem is circumvented by using mixed electrolytes. In the STM measurements the adsorption and desorption of Cl − was tracked in situ. The structure of the adsorbate layer was identified as (√3 × √3)R30.
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