A Comparison of Fully Automated Methods of Data Analysis and Computer Assisted Heuristic Methods in an Electrode Kinetic Study of the Pathologically Variable [Fe(CN) 6 ] 3–/4– Process by AC Voltammetry
AuthorsMorris, Graham P.
Simonov, Alexandr N.
Mashkina, Elena A.
Baker, Ruth E.
Gavaghan, David J.
Bond, Alan M.
KAUST Grant NumberKUK-C1-013-04
MetadataShow full item record
AbstractFully automated and computer assisted heuristic data analysis approaches have been applied to a series of AC voltammetric experiments undertaken on the [Fe(CN)6]3-/4- process at a glassy carbon electrode in 3 M KCl aqueous electrolyte. The recovered parameters in all forms of data analysis encompass E0 (reversible potential), k0 (heterogeneous charge transfer rate constant at E0), α (charge transfer coefficient), Ru (uncompensated resistance), and Cdl (double layer capacitance). The automated method of analysis employed time domain optimization and Bayesian statistics. This and all other methods assumed the Butler-Volmer model applies for electron transfer kinetics, planar diffusion for mass transport, Ohm's Law for Ru, and a potential-independent Cdl model. Heuristic approaches utilize combinations of Fourier Transform filtering, sensitivity analysis, and simplex-based forms of optimization applied to resolved AC harmonics and rely on experimenter experience to assist in experiment-theory comparisons. Remarkable consistency of parameter evaluation was achieved, although the fully automated time domain method provided consistently higher α values than those based on frequency domain data analysis. The origin of this difference is that the implemented fully automated method requires a perfect model for the double layer capacitance. In contrast, the importance of imperfections in the double layer model is minimized when analysis is performed in the frequency domain. Substantial variation in k0 values was found by analysis of the 10 data sets for this highly surface-sensitive pathologically variable [Fe(CN) 6]3-/4- process, but remarkably, all fit the quasi-reversible model satisfactorily. © 2013 American Chemical Society.
CitationMorris GP, Simonov AN, Mashkina EA, Bordas R, Gillow K, et al. (2013) A Comparison of Fully Automated Methods of Data Analysis and Computer Assisted Heuristic Methods in an Electrode Kinetic Study of the Pathologically Variable [Fe(CN) 6 ] 3–/4– Process by AC Voltammetry . Anal Chem 85: 11780–11787. Available: http://dx.doi.org/10.1021/ac4022105.
SponsorsThis publication is based on work supported by Award No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST). Financial support from the Australian Research Council is also gratefully acknowledged. Authors are grateful to Mr. Blair Bethwaite (Monash eResearch Centre, Monash University, Australia), Dr. Jeff Tan (IBM Research, Melbourne, Australia), and Prof. David Abramson (University of Queensland, Australia) for their generous assistance with processing experimental data using Nimrod tools.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Resistance, capacitance, and electrode kinetic effects in Fourier-transformed large-amplitude sinusoidal voltammetry: emergence of powerful and intuitively obvious tools for recognition of patterns of behavior.
- Authors: Sher AA, Bond AM, Gavaghan DJ, Harriman K, Feldberg SW, Duffy NW, Guo SX, Zhang J
- Issue date: 2004 Nov 1
- Inappropriate use of the quasi-reversible electrode kinetic model in simulation-experiment comparisons of voltammetric processes that approach the reversible limit.
- Authors: Simonov AN, Morris GP, Mashkina EA, Bethwaite B, Gillow K, Baker RE, Gavaghan DJ, Bond AM
- Issue date: 2014 Aug 19
- Large amplitude Fourier transformed ac voltammetry at a rotating disc electrode: a versatile technique for covering Levich and flow rate insensitive regimes in a single experiment.
- Authors: Bano K, Kennedy GF, Zhang J, Bond AM
- Issue date: 2012 Apr 14
- Investigation of mediated oxidation of ascorbic acid by ferrocenemethanol using large-amplitude Fourier transformed ac voltammetry under quasi-reversible electron-transfer conditions at an indium tin oxide electrode.
- Authors: Lertanantawong B, O'Mullane AP, Zhang J, Surareungchai W, Somasundrum M, Bond AM
- Issue date: 2008 Sep 1