Abstract
The behaviour of sulphide species at a silver/electrolyte interface along with the electrodeposition of thin Ag 2S films have been studied by a combination of electrochemical and in situ 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 her, ascribed to the formation of an Ag(Sh − ads bond. Phase Ag 2S deposits were found to fit a linear relationship between reflectance, in the blue region, and charge. The oxidation of surface Ag 2S (postwave) is readily observed by differential reflectance at potentials positive of the onset of bulk Ag 2S formation. The rough silver surface brought about by the reduction of Ag 2S allows a strong coupling between photons and surface plasmons.
Highlights
Silver sulphide flms have been a subject of increasing interest in the last few years because of their electrical and optical properties[l-91.The electroformation of silver sulphide tihns on silver metal is of interest for its application to ion selective electrodes[lO] and, from the viewpoint of corrosion studies, in relation to the tarnishing phenomena of silver
In this communication we present data, obtained through in situ optical @u-visible) and electrochemical techniques, for relatively thin films of silver sulphide, not thicker than cu
Optical measurements were obtained with p polarized light at an incident angle of 59” using either a reflectance spectrometer specially designed for electrochemical systems with the aid of potential modulation[13], or a computerized optical multichannel analyser (OMA) fitted with a cooled Si diode array
Summary
Silver sulphide flms have been a subject of increasing interest in the last few years because of their electrical and optical properties[l-91. The electrochemical recovery of silver from silver sulphide materials is of industrial relevance. Silver sulphide systems have been investigated with a view to developing superionic conductors[ 1l] and photosensitive materials for recording media[ 121. In this communication we present data, obtained through in situ optical @u-visible) and electrochemical techniques, for relatively thin films of silver sulphide, not thicker than cu. IOOA,grown on polycrystalline silver electrodes with the aim of providing complementary information on the properties of the film species
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