کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6472394 1424137 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
General Theory for Pulse Voltammetric Techniques at Rough Electrodes: Multistep Reversible Charge Transfer Mechanism
ترجمه فارسی عنوان
تئوری عمومی برای تکنیک های ولتاژ پالس در الکترودهای خشن: مکانیسم انتقال شار چندملیتی
کلمات کلیدی
ولتاژ سنجی پله های چرخه ای، ولتاژ سنج پالس دیفرانسیل، ولتاژ سنج میدان موج، مکانیسم انتقال شار چندتایی، الکترود فروکتال خشن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

Theoretical model is developed for the voltammetric response of multistep reversible charge transfer mechanism at rough electrode. This theory is applicable for arbitrary as well as random roughness profiles. An explicit mathematical expression relating the staircase (SCV), cyclic staircase (CSCV), differential pulse (DPV) and square wave (SWV) voltammetric response of finite fractal electrode to the statistical morphological characteristics is obtained. The fractal characteristics, viz. fractal dimension (DH), lower length scale of fractality (ℓ) and topothesy length (ℓτ) are found to dominantly control the various voltammetric techniques responses of a multistep charge transfer mechanism. The heights of the voltammetric peaks corresponding to each charge transfer step is found to increase with increasing roughness. In CSCV, the anomalous intermediate scan rate window of Randles-Sevc˘ik plots shifts with the number of charge transfer step. The peak current for the charge transfer step occurring at lower potential has an early onset of the influence of morphology, i.e., the anomalous regime window shifts at lower scan rates compared to those occurring at higher potential values. The differential techniques show roughness induced current enhancement for all the peaks without affecting the position of the peak potential. Thus, roughness helps to overcome the major drawback of low Faradaic current in these techniques and improves their application for chemical sensing purposes.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 220, 1 December 2016, Pages 475-485
نویسندگان
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