The silver surface screening effects by specifically adsorbed halide anions in the electrocatalytic reduction of a model organic bromide (acetobromoglucose) have been studied by cyclic voltammetry on controlled mono- and polycrystalline silver surfaces in acetonitrile+0.1 M tetraethylammonium perchlorate medium as a function of the concentration cX of added TEAX (X = Cl, Br, or I, TEA, tetraethylammonium). The reduction peak potentials, Ep, are regularly shifted in the negative direction with increasing cX, typically tending to an asymptotic value for cX ≈ 0.1 M. Several literature models describing adsorption/desorption equilibria have been applied to justify the above experimental Ep versus c X trends (being logarithmic in the iodide cases) for the three halides and the four silver surfaces tested.
Surface screening effects by specifically adsorbed halide anions in the electrocatalytic reduction of a model organic halide at mono- and polycrystalline silver in acetonitrile / P. R. Mussini, S. Ardizzone, G. Cappelletti, M. Longhi, S. Rondinini, L. M. Doubova. - In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY. - ISSN 1572-6657. - 552(2003), pp. 213-221.
Surface screening effects by specifically adsorbed halide anions in the electrocatalytic reduction of a model organic halide at mono- and polycrystalline silver in acetonitrile
P. R. Mussini;S. Ardizzone;G. Cappelletti;M. Longhi;S. Rondinini;
2003
Abstract
The silver surface screening effects by specifically adsorbed halide anions in the electrocatalytic reduction of a model organic bromide (acetobromoglucose) have been studied by cyclic voltammetry on controlled mono- and polycrystalline silver surfaces in acetonitrile+0.1 M tetraethylammonium perchlorate medium as a function of the concentration cX of added TEAX (X = Cl, Br, or I, TEA, tetraethylammonium). The reduction peak potentials, Ep, are regularly shifted in the negative direction with increasing cX, typically tending to an asymptotic value for cX ≈ 0.1 M. Several literature models describing adsorption/desorption equilibria have been applied to justify the above experimental Ep versus c X trends (being logarithmic in the iodide cases) for the three halides and the four silver surfaces tested.Pubblicazioni consigliate
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