A systematic study was performed on the specific adsorption of bromide and iodide anions on controlled-surface polycryst. Ag electrodes, from 3 org. solvents (acetonitrile (ACN), propylene carbonate (PC), and DMF), combining differential capacity and impedance expts. with a recently proposed indirect voltammetric method based on the monitoring of the neg. shift of the redn. peak potential of a probe org. halide mol. induced by progressive addns. of halide anions, resulting in increasing adsorption competition. Bromide and iodide ions are specifically adsorbed onto polycryst. Ag electrodes in the 3 org. solvents studied. The adsorption process, which is slow and it is characterized by a partial charge transfer and by a slow diffusion step, is modulated by the different coordination abilities of the solvents for the species involved in the adsorption. The 3 exptl. methods provide consistent results. In particular, the strength of halide adsorption increases in the halide sequence Br- < I-, and in the solvent sequence ACN < PC < DMF.

Specific adsorption of bromide and iodide anions from nonaqueous solutions on controlled-surface polycrystalline silver electrodes / L. Falciola, P.R. Mussini, S. Trasatti, L.M. Doubova. - In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY. - ISSN 1572-6657. - 593:1-2(2006), pp. 185-193.

Specific adsorption of bromide and iodide anions from nonaqueous solutions on controlled-surface polycrystalline silver electrodes

L. Falciola;P.R. Mussini;S. Trasatti;
2006

Abstract

A systematic study was performed on the specific adsorption of bromide and iodide anions on controlled-surface polycryst. Ag electrodes, from 3 org. solvents (acetonitrile (ACN), propylene carbonate (PC), and DMF), combining differential capacity and impedance expts. with a recently proposed indirect voltammetric method based on the monitoring of the neg. shift of the redn. peak potential of a probe org. halide mol. induced by progressive addns. of halide anions, resulting in increasing adsorption competition. Bromide and iodide ions are specifically adsorbed onto polycryst. Ag electrodes in the 3 org. solvents studied. The adsorption process, which is slow and it is characterized by a partial charge transfer and by a slow diffusion step, is modulated by the different coordination abilities of the solvents for the species involved in the adsorption. The 3 exptl. methods provide consistent results. In particular, the strength of halide adsorption increases in the halide sequence Br- < I-, and in the solvent sequence ACN < PC < DMF.
solvent effects ; specific adsorption ; polycrystalline silver electrode ; halide anions ; electrocatalysis
Settore CHIM/02 - Chimica Fisica
Settore CHIM/01 - Chimica Analitica
2006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/30369
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