Planar diffusion to macro disc electrodes—what electrode size is required for the Cottrell and Randles-Sevcik equations to apply quantitatively?

Simulations and experiments are reported which investigate the size of a macro disc electrode necessary to quantitatively show the chronoamperometric or voltammetric behaviour predicted by the Cottrell equation or the Randles-Sevcik equation on the basis of exclusive one-dimensional diffusional mass...

Full description

Saved in:
Bibliographic Details
Published inJournal of solid state electrochemistry Vol. 18; no. 12; pp. 3251 - 3257
Main Authors Ngamchuea, Kamonwad, Eloul, Shaltiel, Tschulik, Kristina, Compton, Richard G.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2014
Subjects
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Energy Storage
Original Paper
Physical Chemistry
Cyclic voltammetry
Mass transport
Cottrell equation
One-dimensional planar diffusion
Chronoamperometry
Randles-Sevcik equation
Online AccessGet full text

Cover

More Information
Summary:Simulations and experiments are reported which investigate the size of a macro disc electrode necessary to quantitatively show the chronoamperometric or voltammetric behaviour predicted by the Cottrell equation or the Randles-Sevcik equation on the basis of exclusive one-dimensional diffusional mass transport. For experimental time scales of several seconds, the contribution of radial diffusion is seen to be measurable even for electrodes of millimetres in radius. Recommendations on the size of macro electrodes for quantitative study are given and should exceed 4 mm radius in aqueous solution.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-014-2664-z