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 cX 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
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 cX trends (being logarithmic in the iodide cases) for the three halides and the four silver surfaces tested.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
