The group I alkali metals in ionic liquids: Electrodeposition and determination of their kinetic and thermodynamic properties
Journal
ECS Transactions
Journal Volume
33
Journal Issue
7
Start Page
523
End Page
535
ISSN
19385862
ISBN (of the container)
9781607681762
9781566778268
Date Issued
2010
Author(s)
Abstract
Cyclic voltammetric experiments were carried out on Li+, Na +, K+, Rb+ and Cs+ in ionic liquids (ILs). Alloy formation was noted at Pt microelectrodes, but not at Ni. A range of ILs was investigated to identify the best IL to study the M/M+ redox couples, and bulk electrodeposition of all metals was observed in at least one IL, N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C4mpyrr] [NTf2]). Mathematical simulation of the CVs in this IL was conducted as a function of temperature. The diffusion coefficients, D, of the five metal ions were determined. The formal potential, E f0 (vs. Fc/Fc+) of the five M/M+ couples was quantified, as well as the electrochemical rate constants, k 0, and transfer coefficients, α. The activation energies of diffusion, Ea,dif, of Li+ and Na+ ions, and electron transfer, Ea, of Li/Li+ and Na/Na+ were determined, and ΔS0 (vs. Fc/Fc+) estimated for the Na/Na+ couple. The trends within the group are discussed. ©The Electrochemical Society.
Event(s)
17th International Symposium on Molten Salts and Ionic Liquids - 218th ECS Meeting, 10 October 2010 through 15 October 2010, Las Vegas, NV, code: 84199
Publisher
Electrochemical Society Inc.
Type
conference paper