The effect of concentration in electrochemical oxidation of thiocyanate on platinum electrode期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The effect of concentration in electrochemical oxidation of thiocyanate on platinum electrode

Authors:	P Krishnan

Institution:	(1) Department of Chemical Engineering, Indian Institute of Technology, Powai, Mumbai, 400 076, India;(2) Present address: Department of Polymer Science, University of Southern Mississippi, P.O. Box 10076, Hattiesburg, MS 39406-0076, USA

Abstract:	Electrochemical oxidation of thiocyanate (SCN⁻) on platinum electrode in the sulfuric acid medium was studied using cyclic voltammetry, in situ UV-visible absorption measurement, rotating ring-disc electrode voltammetry, and electrical impedance spectroscopy. Two oxidation processes are involved in the electrochemical oxidation of SCN⁻ in sulfuric acid medium. The adsorbed SCN⁻ undergoes oxidation at potential values higher than 0.900 V versus saturated calomel electrode (SCE). Trithiocyanate, ${\left( { {SCN} } \right)}^{ - }_{3}$ , is formed as a relatively stable product during the first oxidation process. The potential range of ${\left( { {SCN} } \right)}^{ - }_{3}$ formation increases with increase in concentration of SCN⁻, and it is exclusively produced in the potential range of 0.550 to 1.40 V versus SCE with 1.0 M NH₄SCN solution. The second oxidation process does not produce any stable product, and the products of second oxidation passivate the electrode surface.

Keywords:	Electrochemical oxidation Thiocyanate Trithiocyanate Thiocyanogen Cyclic voltammetry Rotating ring-disc electrode voltammetry Spectroelectrochemistry
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