Masaki R. Yamagata, Y. Katayama, T. Miura
2006
Citations
1
Influential Citations
74
Citations
Quality indicators
Journal
Journal of The Electrochemical Society
Abstract
The electrochemical behavior of samarium (Sm), europium (Eu), and ytterbium (Yb) was investigated in the hydrophobic room-temperature molten salts based on bis(trifluoromethylsulfonyl)imide (TFSI - ) combined with either 1-ethyl-3-methylimidazolium (EMI + ) or 1-n-butyl-l-methylpyrrolidinium (BMP + ). The redox reactions of Sm(III)/Sm(II), Eu(III)/Eu(II), and Yb(III)/Yb(II) were observed at -1.6, -0.3, and -1.0 V vs Ag/Ag(I), respectively. In all cases, the electrode reactions were found to be quasi-or irreversible by the cyclic voltammetry. The diffusion coefficients of these lanthanides were estimated to be ∼10 - 8 cm 2 s - 1 by chronoamperometry and chronopotentiometry, indicating that their mobility is rather low, probably due to the complex formation or the strong coulombic interaction with TFSI - . The redox potentials of these divalent and trivalent lanthanide couples suggested that the donor property of TFSI - -based room-temperature molten salts was lower than that of other conventional solvents.