Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 526, Issue 1-2, Pages 107-114Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(02)00751-9
Keywords
standard reaction rates; reduction of Eu3+; tetraethylammonium perchlorate; dimethylsulfoxide; double layer capacitances
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The effect of different concentrations of the supporting electrolyte tetraethylammonium perchlorate on the standard electrode reaction rate constants for the one-electron reduction of Eu(CF3SO3)(3) on mercury in dimethylsulfoxide has been measured. Two techniques: (i) ac polarography on the dropping mercury electrode; and (ii) cyclic voltammetry (CV) in a two electrode system were employed. The ac data were evaluated both by the Randles and by the Sluyters methods. The standard reaction rates from CV were extracted via a simulation program. Viscosities, resistivities, densities and the double layer capacitances of the electrolytes are given. Correlations between electrolyte properties and the k(s)(app)-values are discussed. The standard electrode reaction rates were analyzed according to the Frumkin theory. (C) 2002 Elsevier Science B.V. All rights reserved.
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