Estimation of electrode kinetic and uncompensated resistance parameters and insights into their significance using Fourier transformed ac voltammetry and e-science software tools

Mashkina, Elena, Peachey, Tom, Lee, Chong-Yong, Bond, Alan M., Kennedy, Alan M., Enticott, Colin, Abramson, David and Elton, Darrell (2013) Estimation of electrode kinetic and uncompensated resistance parameters and insights into their significance using Fourier transformed ac voltammetry and e-science software tools. Journal of Electroanalytical Chemistry, 690 104-110. doi:10.1016/j.jelechem.2012.11.002


Author Mashkina, Elena
Peachey, Tom
Lee, Chong-Yong
Bond, Alan M.
Kennedy, Alan M.
Enticott, Colin
Abramson, David
Elton, Darrell
Title Estimation of electrode kinetic and uncompensated resistance parameters and insights into their significance using Fourier transformed ac voltammetry and e-science software tools
Journal name Journal of Electroanalytical Chemistry   Check publisher's open access policy
ISSN 1572-6657
1873-2569
Publication date 2013-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.jelechem.2012.11.002
Open Access Status Not yet assessed
Volume 690
Start page 104
End page 110
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier
Language eng
Subject 1500 Chemical Engineering
1602 Criminology
1603 Demography
Formatted abstract
In transient forms of voltammetry, quantitative analysis of electrode kinetics and parameters such as uncompensated resistance (Ru) and double layer capacitance (Cdl) are usually undertaken by comparing experimental and simulated data. Commonly, the skill of the experimentalist is heavily relied upon to decide when a good fit of simulated to experimental data has been achieved. As an alternative approach, it is now shown how data analysis can be based on implementation of e-science software tools. Previously, a standard heuristic data analysis approach applied to the oxidation of ferrocene in acetonitrile (0.1 M Bu4NPF6) at a glassy carbon electrode using higher order harmonics available in Fourier transformed ac voltammetry implied that the heterogeneous charge transfer rate constant k 0 is ≥0.25 cm s-1 with the charge transfer coefficient (α) lying in the range of 0.25-0.75. Application of e-science software tools to the same data set allows a more meaningful understanding of electrode kinetic data to be provided and also offers greater insights into the sensitivity of the IRu (Ohmic drop) on these parameters. For example, computation of contour maps based on a sweep of two sets of parameters such as k0 and Ru or α and k0 imply that α is 0.50 ± 0.05 and that k0 lays in the range 0.2-0.4 cm s -1 with Ru around 130 Ohm. Quantitative evaluation of k0, α and Ru for the quasi-reversible [Fe(CN) 6]3-+e⇌[Fe(CN)6]4- process at a glassy carbon electrode in aqueous media is also facilitated by use of e-science software tools. In this case, when used in combination with large amplitude Fourier transformed ac voltammetry, it is found for each harmonic that k 0 for the electrode process lies close to 0.010 cm s-1, α is 0.50 ± 0.05 and Ru is ≤10 Ohm.
Keyword Electrode kinetics
Simulations
Fourier transform techniques
E-science
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Information Technology and Electrical Engineering Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 17 Oct 2013, 02:37:47 EST by Ms Diana Cassidy on behalf of Scholarly Communication and Digitisation Service