کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
220301 463326 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical studies on the redox behaviour of zirconium in molten LiCl–KCl eutectic
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical studies on the redox behaviour of zirconium in molten LiCl–KCl eutectic
چکیده انگلیسی

Electrochemical studies on zirconium chloride in molten LiCl–KCl eutectic were carried out in presence and absence of Zr metal, in the temperature range 773–848 K using transient techniques such as cyclic voltammetry, square wave voltammetry, convolution voltammetry and chronopotentiometry. Two cathodic peaks due to Zr4+/Zr2+ and simultaneous reduction of Zr2+/Zr and Zr2+/Zr+ were observed in the cyclic voltammograms obtained in the absence of Zr metal. When cyclic voltammetry was carried out in presence of Zr metal, a cathodic peak corresponding to Zr+/Zr was observed which shifted to more cathodic potentials and that due to Zr4+/Zr2+ was not observed due to the disproportionation reaction involving Zr and Zr4+. However, oxidation of Zr2+ to Zr4+ was observed in the cyclic voltammograms obtained at higher temperatures. The cyclic voltammograms were complicated by the adsorption of the Zr2+ at the tungsten working electrode. A nucleation overpotential was observed in the cyclic voltammograms of LiCl–KCl–ZrCl4 in presence of Zr metal. Chronopotentiometric transients obtained in the absence of Zr metal showed two transition time plateaus corresponding to Zr4+/Zr2+ and Zr2+/Zr reductions whereas in presence of Zr metal transition time plateaus corresponding to Zr2+/Zr and Zr+/Zr reductions were also observed. Chronopotentiometry also showed that the electrode process due to Zr+/Zr was irreversible. There was no evidence of Zr3+ species in any of the cyclic voltammograms.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 627, Issues 1–2, 1 March 2009, Pages 15–27
نویسندگان
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