Diffusional Impedance of a Recessed Microelectrode

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

Electrochemical impedance spectroscopy for a recessed microelectrode is evaluated as a function the recess depth. The Nyquist diagram of impedance is shown on the left. The geometry of the recessed electrode is shown on the right.

Contributed by: Quang-Dao Trinh (December 2011)
Open content licensed under CC BY-NC-SA



The impedance of the recessed microelectrode is shown in the Nyquist plot on the left; the unit of impedance is ohm ().

For a small recess depth (snapshot 1), the recessed microelectrode performs as an inlaid microdisc electrode; the diffusional impedance is similar to the impedance of a microdisc electrode. As the recess depth increases (snapshot 3), the spherical diffusion occurring at the edge of the microelectrode is reduced; the linear diffusion prevails in the recess and the diffusional impedance evolves to the Warburg impedance.


L. Murtomäki and K. Kontturi, "Electrochemical Characteristics of the Microhole ITIES," Journal of Electroanalytical Chemistry, 449(1–2), 1998 pp. 225–229. doi:10.1016/S0022-0728(98)00051-5.

Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.