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Abstract
One monolayer of Cu was prepared on Au(111) by underpotential deposition from CuSO4/H2SO4 solution and, by two electrolyte exchanges for (i) Cu-free H2SO4 and (ii) NaOH/Na2S solution, exposed to bisulfide. This procedure leads to several incommensurate phases with characteristic stripe patterns. These are irreversibly displaced upon cathodic potential sweeps by different structures, which, after returning to the initial potential, transform into the rectangular CuxS phase already known for the sulfidation of a Cu submonolayer on Au(111).
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