Wall-jet electrodes : the importance of radial diffusion

Existing models for mass transport to wall-jet electrodes (WJE) are critically re-evaluated in the light of some new calculations and experiments which relate to steady state and transient currents observed at wall-jet ring disc electrodes both in the presence and absence of homogeneous chemical kin...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1993-02, Vol.23 (2), p.98-102
Main Authors: COMPTON, R. G, FISHER, A. C, LATHAN, M. H, WELLINGTON, R. G, BRETT, C. M. A, OLIVEIRA BRETT, A. M. C. F
Format: Article
Language:English
Subjects:
Chemistry
Diffusion
Electrochemistry
Exact sciences and technology
General and physical chemistry
Mass transfer
Study of interfaces
Transport phenomena
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Summary:Existing models for mass transport to wall-jet electrodes (WJE) are critically re-evaluated in the light of some new calculations and experiments which relate to steady state and transient currents observed at wall-jet ring disc electrodes both in the presence and absence of homogeneous chemical kinetic complications. Specifically, it is concluded that in many cases quantitative descriptions are only realisable if transport to the electrode is described as having a significant contribution from radial diffusion in addition to the radial convection and normal diffusion that are usually only considered. This greatly increases the complexity of the mathematical solution of problems of interest and may prove an important limitation of WJEs vis-a-vis alternative hydrodynamic electrodes for other than analytical purposes.
ISSN:0021-891X
1572-8838
DOI:10.1007/BF00246944