# Simulation Domain for a Microelectrode: Is It Large Enough?

Simulation Domain for a Microelectrode: Is It Large Enough?

For a microdisk electrode, the region of interest in the simulation domain is a few times larger than the microelectrode dimension (ca 10 μm). The typical electrochemical cell dimension is about 5 cm, where the far-field boundary conditions for bulk concentration are applicable. This far boundary is thus 5000 times larger than the region of interest, and simulating such a large domain is not very accurate; consequently, the far-field distance is often truncated. The accuracy of the simulated current in the microelectrode depends on how much the far-field boundary conditions are truncated. This Demonstration addresses the question: is the simulation domain large enough to get a satisfactory result?