Electrochemical and spectroscopic studies of ytterbium in the aluminum chloride-1-methyl-3-ethylimidazolium chloride room temperature molten salt

Wei Jyh Gau, I. Wen Sun

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

UV-visible absorption spectroscopy and amperometric titration experiments indicate that the ytterbium(III) chloride is complexed as the ytterbium(III) hexachloride, [YbCl6]3, in basic aluminum chloride-1-methyl-3-ethylimidazolium chloride molten salt, and [YbCl6]3- can be reduced to Yb(II) species via a quasi-reversible one-electron charge-transfer process. The standard heterogeneous rate constant and cathodic transfer coefficient for the reduction of [YbCl6]3- in 44.4/55.6 mole percent melt are 1.29 × 10-4 cm s-1 and 0.59, respectively. The formal potential, E°′', of this redox reaction is dependent upon the pCl of the basic melt, suggesting the loss of one chloride ion from [YbCl6]3- during reduction to produce [YbCl5]3-. In the basic melt, [YbCl5]3- is slowly oxidized by some components of the melt. In acidic melt, Yb(III) is stable and can be electrochemically reduced to produce stable Yb(II) via a reversible one-electron charge-transfer process. The formal potential of the Yb(III)/Yb(II) redox couple in acidic melt is about 2.5 V more positive than the corresponding reaction in basic melt, indicating a significant change in the coordination sphere. Values of the Stokes-Einstein product measured for the Yb(III) and Yb(II) species in these melts are comparable to those of transition metal chloro complexes with the same overall charge in the same melt.

原文English
頁(從 - 到)170-174
頁數5
期刊Journal of the Electrochemical Society
143
發行號1
DOIs
出版狀態Published - 1996 一月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 可再生能源、永續發展與環境
  • 表面、塗料和薄膜
  • 電化學
  • 材料化學

指紋

深入研究「Electrochemical and spectroscopic studies of ytterbium in the aluminum chloride-1-methyl-3-ethylimidazolium chloride room temperature molten salt」主題。共同形成了獨特的指紋。

引用此