کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
190288 459695 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Observed electrochemical oscillations during the oxidation of aqueous sulfur dioxide on a sulfur modified platinum electrode
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Observed electrochemical oscillations during the oxidation of aqueous sulfur dioxide on a sulfur modified platinum electrode
چکیده انگلیسی

The electrochemical oxidation of aqueous sulfur dioxide has been investigated on a sulfur modified polycrystalline platinum electrode. It has been found that time and potential-based current oscillations occur on a modified electrode in the oxidation region >0.7 V vs. SHE. The oscillation is specific to catalytic oxidation on sulfur modified platinum and is not observed on an unmodified electrode. Using i–R compensation techniques, the oscillation has been found to stem from electrochemical origins; the interfacial potential being an essential variable. The influence of other controllable variables including holding potential, sulfur dioxide concentration and sulfuric acid concentration have also been investigated for their effects on the oscillation. The electrochemical oscillation is explained here in part by the intermediate formation of dithionate. Two possible mechanisms, including a dual pathway mechanism, are explored.

Research highlights
► Mechanistic investigation of the catalytic oxidation of aqueous SO2 on platinum.
► Current oscillation observed during oxidation in the potential region 0.7 < E < 1.2 V.
► Oscillation classified as electrochemical with interfacial potential essential.
► Dual pathway mechanism proposed including dithionate intermediate.
► Significant step in understanding catalytic oxidation mechanism of SO2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 11, 15 April 2011, Pages 4224–4230
نویسندگان
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