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Title of article :
Adsorption competition effects in the electrocatalytic reduction of organic halides on silver
Author/Authors :
Ardizzone، نويسنده , , Silvia and Cappelletti، نويسنده , , Giuseppe and Mussini، نويسنده , , Patrizia Romana and Rondinini، نويسنده , , Sandra and Doubova، نويسنده , , Lioudmila M، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Pages :
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Abstract :
A systematic study of {silver ∣ inorganic and/or organic halide} interphases is described, based on cyclovoltammetric and impedance experiments carried out on polycrystalline electrodes of high reproducibility (controlled by comparison with monocrystalline ones), in water and in acetonitrile. The adsorption competition is brought into focus (i) between the three inorganic halides Cl−, Br−, and I−, with the possible interference of ions from the supporting electrolyte, and (ii) between organic and inorganic halides, especially iodides. Actually adsorption competition proves to be a determining factor in the electrocatalytic mechanism (a remarkable threshold effect being observed for the reduction potentials of organic bromides in correspondence with the limiting negative potential for iodide anion adsorption). Vice versa, the variation of the reduction potentials of a given reacting molecule with the background electrolyte provides significant clues on the nature of the specifically adsorbed species.
Keywords :
silver , halide anions , organic halides , Specific adsorption , Adsorption competition , Organic electrocatalysis
Journal title :
Journal of Electroanalytical Chemistry
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Link To Document :