Apparent Anomaly during Rotating Disk Voltammetry in Ionic Liquids
- 1 January 2002
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 149 (11), E468-E471
- https://doi.org/10.1149/1.1514647
Abstract
An apparent anomaly is described in which maxima on rotating disk voltammograms for ferrocene oxidation in an ionic liquid were found. The ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, bmimPF6,bmimPF6, is a neoteric solvent of current interest. The maxima are shown to be due to the very high viscosity of the solvent, 3.26 poise, which yields an unusually high Schmidt number (Sc)(Sc) of 3.5×107,3.5×107, compared to a value of about 103103 for aqueous solutions. It is estimated that over 100 revolutions of the disk are needed to achieve the Levich limiting current following application of a voltage step to the disk. The current transient resulting from application of a voltage step to the rotating disk is found to be in agreement with previously developed theory, even for these highly viscous systems. Analysis of the transient permits a determination of ScSc values without measurement of the viscosity and density of the solvent, or diffusion coefficient of the reacting species. © 2002 The Electrochemical Society. All rights reserved.Keywords
This publication has 10 references indexed in Scilit:
- Room-Temperature Ionic Liquids. Solvents for Synthesis and CatalysisChemical Reviews, 1999
- Synthesis and physical-chemical properties of ionic liquids based on 1-n-butyl-3-methylimidazolium cationJournal de Chimie Physique et de Physico-Chimie Biologique, 1998
- Formation and Electrochemistry of Polyfluorene in Ambient Temperature Ionic LiquidsJournal of the Electrochemical Society, 1988
- Determining kinetic parameters from pulse voltammetric dataThe Journal of Physical Chemistry, 1986
- Statistical properties of a procedure for analyzing pulse voltammetric dataJournal of Research of the National Bureau of Standards, 1985
- Voltammetric determination of water in an aluminum chloride-N-n-butylpyridinium chloride ionic liquidAnalytical Chemistry, 1983
- Increased Electrochemical Window in Ambient Temperature Neutral Ionic LiquidsJournal of the Electrochemical Society, 1983
- Dialkylimidazolium chloroaluminate melts: a new class of room-temperature ionic liquids for electrochemistry, spectroscopy and synthesisInorganic Chemistry, 1982
- Pulse voltammetry at rotated electrodesAnalytical Chemistry, 1974
- Current transients at a rotating disk electrode produced by a potential stepAnalytical Chemistry, 1967