ISSN:
1040-0397
Keywords:
Ohmic distortion
;
Hydrodynamic electrodes
;
Finite-element method
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A finite-element method is described that predicts the effects of ohmic distortion of current-voltage curves for arbitrary cell and hydrodynamic electrode geometries using the widely available circuit analysis program SPICE. Simulated and experimental data are presented for a channel electrode flow cell showing the displacement of the half-wave potential and the potential-dependent error in the Tafel slope for the case of an electrochemically reversible electrode reaction. Error curves are provided that may be scaled for different electrolyte conductivities as a guide to the maximum current levels that may be used in practice. For analytical flow detection work, the displacement of the half-wave potential under certain conditions implies that high detection potentials must be used to obtain the correct concentration-related current intensity. The implications for quantitative measurements using practical electrodes are assessed.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140050108
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