Abstract
The nature of the sulphur species adsorbed on platinum electrodes, formed “in situ” by oxidation of sulphides in acid medium, and the electronic effects they may induce, were investigated using two different experimental techniques: cyclic voltammetry and UV-visible reflectance spectroscopy. The results show that polysulphides and/or neutral sulphur are present in the adsorbed layer. In the so-called hydrogen region of the platinum electrode, the adsorbed sulphur species appear to interact with adsorbed hydrogen atoms. Furthermore, accumulation of multilayers does occur before the completion of a monolayer (i.e. for θ s > 0.60–0.70). The coadsorption of sulphur and cinnamic acid was also studied using the same experimental techniques. Adsorption of cinnamic acid was found to be favoured by the presence of previously adsorbed sulphur species. This result points out that adsorbed sulphur species induce long range electronic effects and demonstrates that the bond between sulphur and platinum is polarized.
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