Articulo
Optical and electrochemical study of the sulphide/silver system
Autor
Juanto, S.
Lezna, Reynaldo Oscar
Arvia, Alejandro Jorge
Institución
Resumen
The behaviour of sulphide species at a silver/electrolyte interface along with the electrodeposition of thin Ag<sub>2</sub>S films have been studied by a combination of electrochemical and <i>in situ</i> optical methods. The potential region between −1.08 and −0.470 V (nhe), pre-peak zone, is mainly characterized by a reversible process at −0.870 V, overlapping and catalysing the <i>her</i>, ascribed to the formation of an Ag−(Sh−<sub>ads</sub> bond. Phase Ag<sub>2</sub>S deposits were found to fit a linear relationship between reflectance, in the blue region, and charge. The oxidation of surface Ag<sub>2</sub>S (postwave) is readily observed by differential reflectance at potentials positive of the onset of bulk Ag<sub>2</sub>S formation. The rough silver surface brought about by the reduction of Ag<sub>2</sub>S allows a strong coupling between photons and surface plasmons. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas