کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9634202 | 463399 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ion-pairing kinetics investigated using nanometer-size Pt electrodes
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ion-pairing kinetics investigated using nanometer-size Pt electrodes Ion-pairing kinetics investigated using nanometer-size Pt electrodes](/preview/png/9634202.png)
چکیده انگلیسی
The kinetics of ion pairing of IrCl63- with K+, Ca2+ and tetraethylammonium (TEA+) were investigated by steady-state voltammetry at disk and hemispherically shaped Pt electrodes. A general square-scheme mechanism is employed that allows for redox reactions of both free and ion paired IrCl63- and IrCl62-. Numerical simulations of the voltammetric response employing the ion pairing square scheme suggest that the dissociation rate constant of the reactant ion pair can be determined from the voltammetric wave shape recorded at very small electrodes. No ion-pair kinetic limitation was discernable in K+ and Ca2+ solutions using Pt hemispherical electrodes with radii as small as 13 nm, indicating that ion-pair dissociation in these solutions occurs at rates greater than 107 sâ1. However, the voltammetric wave in 1 M TEA+ displays a shoulder at electrodes with radii less than 500 nm, consistent with a slower rate of ion-pair dissociation. The appearance of the shoulder is predicted by the numerical simulations and corresponds to a direct observation of the oxidation of both free and ion paired IrCl63- in the same solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 582, Issues 1â2, 15 August 2005, Pages 57-63
Journal: Journal of Electroanalytical Chemistry - Volume 582, Issues 1â2, 15 August 2005, Pages 57-63
نویسندگان
John J. Watkins, Henry S. White,