Electrochemical Properties of Alkali Metals in 1-Butyl-3-methylimidazolium Hexafluorophosphate

Publisher Website
Google Scholar
Abstract
Formal potentials and diffusion coefficients of the alkali metal couples of lithium, sodium, and potassium hexafluorophosphate salts dissolved in 1-butyl-3-methylimidazolium hexafluorophosphate were determined using a hanging mercury drop electrode as the working electrode. Chronoamperometry was used to determine the diffusion coefficients, which ranged from 1.4×10−81.4×10−8 to 4.5×10−8 cm2/s4.5×10−8 cm2/s for the Na and K cations, respectively. Formal reduction potentials of −2.96±0.01V−2.96±0.01V and −3.35±0.01V−3.35±0.01V vs. the ferrocene/ferrocenium couple were obtained for sodium and potassium using normal pulse voltammetry. The presence of adsorption maxima in the lithium normal pulse voltammograms necessitated the use of chronopotentiometry to determine a lithium formal potential of −2.45±0.02V.−2.45±0.02V. © 2002 The Electrochemical Society. All rights reserved.

This publication has 13 references indexed in Scilit: