کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
189048 459672 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemistry and Raman spectroscopy of niobium reduction in basic and acidic pyrrolidinium based ionic liquids. Part I: 1-Butyl-1-methylpyrrolidinium chloride with NbCl5
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemistry and Raman spectroscopy of niobium reduction in basic and acidic pyrrolidinium based ionic liquids. Part I: 1-Butyl-1-methylpyrrolidinium chloride with NbCl5
چکیده انگلیسی

The electrochemical behaviour of basic and acidic ionic liquids (x)1-butyl-1-methyl-pyrrolidinium chloride-(1 − x)NbCl5 at x = 0.80, 0.60, and 0.40 was investigated over the temperature range 90–160 °C in respect to the electrochemical deposition of niobium. This is discussed in connection with in situ Raman spectroscopic data. The mechanism of electrochemical reduction of niobium (V) depends strongly on the structure and composition of the electrochemical active species of niobium (V) defined by the molar composition of the ionic liquids. In basic mixtures at x = 0.80, the self-reduction of Nb(V) → Nb(IV) was confirmed by Raman spectroscopy and [NbCl6]2− (75%) and [NbCl6]− (25%) octahedral complexes are the electrochemical active species at 140 °C. At x = 0.60, the dominant species are NbCl6− octahedra. In acidic ionic liquids at x = 0.40, the electrochemical reduction of two species occurs, NbCl6− and Nb2Cl11−, and it is limited by one electron transfer for NbCl6− at −0.45 V and by two electrons transfer for Nb2Cl11− at −1.12 V and −1.27 V, respectively. In basic melts the electrodeposition of metallic niobium is presumably possible at potentials negative of – 2.1 V versus Pt-quasi reference at a temperature of 140 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 62, 15 February 2012, Pages 234–241
نویسندگان
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