Electrochemical behavior of samarium, europium, and ytterbium in hydrophobic room-temperature molten salt systems

Masaki Yamagata; Yasushi Katayama; Takashi Miura

doi:10.1149/1.2136088

Electrochemical behavior of samarium, europium, and ytterbium in hydrophobic room-temperature molten salt systems

Masaki Yamagata, Yasushi Katayama, Takashi Miura

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

93 Citations (Scopus)

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-1-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 -1.0V 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 ^-8cm ²s ^-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.

Original language	English
Pages (from-to)	E5-E9
Journal	Journal of the Electrochemical Society
Volume	153
Issue number	1
DOIs	https://doi.org/10.1149/1.2136088
Publication status	Published - 2006 Apr 10

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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title = "Electrochemical behavior of samarium, europium, and ytterbium in hydrophobic room-temperature molten salt systems",

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-1-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 -1.0V 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 -8cm 2s -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.",

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AB - 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-1-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 -1.0V 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 -8cm 2s -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.

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Electrochemical behavior of samarium, europium, and ytterbium in hydrophobic room-temperature molten salt systems

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