Abstract
The electrosorption of sorbitol was investigated at polycrystalline and single-crystal platinum electrodes in an acidic medium. The coverage degree and the number of electrons per site involved in the electro-oxidation of the adsorbed species coming from the sorbitol were estimated from voltammetric measurements carried out at high sweep rates and for adsorption times varying from 0.1 to 500 s. The adsorption process depends on the superficial structure. The electrode surface was never saturated by the organic species coming from sorbitol adsorption and the number of electrons per site was found to be around 3, though this decreased to about 2 after long adsorption times. One of the main adsorbed species present at the electrode surface for long adsorption times is linearly adsorbed CO, as confirmed by in situ IR reflectance spectroscopy. The presence of other kinds of adsorbed species is also discussed.
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