کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6661834 | 1426556 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrocatalytic properties of adsorbed halides: The reduction of hexaaquairon(III) on polycrystalline gold in aqueous electrolytes
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
Enhancements in the rates of reduction of hexaaquairon(III), [Fe(H2O)6]3 +, on polycrystalline Au, Au(poly), induced by the adsorption of bromide, Brâ, have been examined by chronoamperometric techniques in 0.1 M HClO4 aqueous solutions containing Brâ at concentrations in the μM (< 1 ppm) range using a Au(poly)|Au(poly) rotating ring | disk electrode, RRDE. The extent of Brâ adsorption on the Au(poly) disk was determined quantitatively by monitoring the diffusion-limited current for the oxidation of Brâ on the Au(poly) ring in solutions devoid of [Fe(H2O)6]3 +. Evidence that Brâ adsorption is not affected by the reduction of [Fe(H2O)6]3 + was obtained from in situ differential reflectance measurements performed in the absence and in the presence of the metal complex in solution. Information derived from these measurements was then used to establish quantitative correlations between the disk current, idisk, associated with the reduction of [Fe(H2O)6]3 + and E, at constant θBrN, and between idisk and the normalized Brâ coverage, θBrN, at constant potential, E. Rather surprisingly, significant increases in electrocatalytic activity over the otherwise bare Au(poly) surface could only be discerned for θBrN > 0.15. Possible explanations for this unexpected behavior are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 819, 15 June 2018, Pages 474-480
Journal: Journal of Electroanalytical Chemistry - Volume 819, 15 June 2018, Pages 474-480
نویسندگان
Adriel J.J. Jeberaj, Nicholas S. Georgescu, Daniel A. Scherson,