How does the double layer at a disk electrode charge?

Because of the nonuniform accessibility of its surface to ion transport from the solution, the double layer at an inlaid disk electrode charges anomalously in response to a potential step. A numerical simulation of the problem shows that the overall current versus time transient differs little from...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2005-01, Vol.575 (1), p.81-93
Main Authors: Myland, Jan C., Oldham, Keith B.
Format: Article
Language:English
Subjects:
Charging current
Chemistry
Chronoamperometry
Disk electrode
Double layer
Electrochemistry
Exact sciences and technology
General and physical chemistry
Potential step
Simulation
Spheroidal coordinates
Study of interfaces
Transport phenomena
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Summary:Because of the nonuniform accessibility of its surface to ion transport from the solution, the double layer at an inlaid disk electrode charges anomalously in response to a potential step. A numerical simulation of the problem shows that the overall current versus time transient differs little from that for a single resistor in series with a single capacitor. Nevertheless, the charging process, away from the disk’s perimeter, differs surprisingly from what might be expected in that the current density initially increases with time.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2004.09.004