کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4908099 | 1426590 | 2017 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Higher order derivative voltammetry for reversible and irreversible electrode processes under spherical diffusion
ترجمه فارسی عنوان
ولتاژ سنجی مشتق شده برای فرآیندهای الکترود برگشت پذیر و غیر قابل برگشت تحت انتشار کروی
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کلمات کلیدی
ولتامتری مشتق شده، سینتیک هتروزانه، الکترودهای کروی برگشت پذیر، نیمه برگشت پذیر، انتقال الکترون غیرقابل برگشت
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Theoretical expressions for the first, second and third derivatives of voltammetric curves are analytically derived for reversible, quasi-reversible, and irreversible processes under spherical diffusion. The shapes of the curves are analyzed n terms of peak-potentials, peak-currents, and peak-widths, and the differences and ratios among them. The results obtained with spherical electrodes are compared with those with the planar electrodes, which exhibits striking differences between two electrodes. Derived parameters - such as ratios of peak-currents (ipa/ipc), and ratios of half-peak-widths (W½a/W½c), and ratios of the differences in peak potentials (ÎEpa/ÎEpc), for various derivatives are analyzed. As electrode sphericity increases, these ratios (i. e., measures of symmetry in the curves) for a quasi-reversible and irreversible electron transfer process approaches to one, which is the same as that for a simple reversible electrode process on a planar electrode. Namely, the asymmetry which was exhibited on planar electrodes for quasi and irreversible processes disappears on a spherical electrode. This suggests that the planar electrode is better suited for kinetic study of slower electron transfer than spherical electrodes for this derivative approach.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 785, 15 January 2017, Pages 255-264
Journal: Journal of Electroanalytical Chemistry - Volume 785, 15 January 2017, Pages 255-264
نویسندگان
Tae-Kee Hong, Iason Rusodimos, Myung-Hoon Kim,