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Merck analytical reagent grade 3CdSO4 ¡£8H2O, and Aldrich analytical reagent grade Na2S were used with-out further purification. Merck analytical reagent grade HClO4 and NH3 were used to prepare the pH 9.2 ammonia buffer used as supporting electrolyte.
As a matter of fact, the whole sulphur (oxidative) underpotential deposition
takes place at potentials negativeto£­0.7 V on Ag(111) and at still more negative potentials on Cd layers,whereas cadmium (reductive) underpotential deposition on S-coated Ag(111) takes place at potentials positive to £­0.8. Hence, both the sulphur and cadmium under-
potential depositions were carried out in ammonia buffer solutions at £­0.75 V (SCE). CdS growth was obtained by depositing sulphur from a Na2S solution,washing the cell with the supporting electrolyte, inject-
ing the cadmium solution, waiting 30 s to deposit Cd,
washing the cell, and repeating this cycle as many times
as desired. Polarisation at constant potential was main-tained during the entire procedure.


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