Microring electrodes: A computational study of transport-limited processes

Journal article

Investigations at microring electrodes are limited by the lack of equations that describe short and long time behavior at rings of all thicknesses. In this paper, a robust finite difference numerical method is presented for the simulation of electrochemical processes at microring electrodes of intermediate thickness. The method relies on a careful meshing strategy to minimize electrode flux errors. The accuracy of the method is first tested by comparison with a well-established reversible steady-state analytical equation. The meshes obtained through this process are reused to produce current results for chronoamperometry and linear-sweep voltammetry. In the case of chronoamperometry, simulated currents show less than ±1.5% difference compared to integral-equation methods. In the case of linear-sweep voltammetry, currents are recorded across nine decades of dimensionless scan rate. Both the dimensionless peak current and voltage at half-peak height are compared with other known methods and shown to be either comparable to or better than alternative results. In the case of the voltage at half-peak height, results are confirmed by simulations at the microdisk electrode.

Authors: Brookes, B; Gavaghan, D; Compton, R

• Publication status: Published
• Journal: JOURNAL OF PHYSICAL CHEMISTRY B
• Volume: 106
• Issue: 18
• Pages: 4886-4896
• Publication date: 2002-05-09
• DOI: 10.1021/jp014049i
• EISSN: 1520-5207
• ISSN: 1520-6106
• Language: English