Abstract
A general two‐dimensional model for simulating electrochemical cells taking into account migration, diffusion, and unsteady‐state effects in stagnant electrolytes is presented. The accuracy of the model is tested by comparing the results for a simple geometry cell with an analytical solution. A more complex simulation for a sensor array is also presented. The model predicts the concentration distribution along the electrode surface, and, hence, the effect of transport and unsteady‐state behavior on the current distribution may be determined. The model is particularly applicable for determining the current distribution in systems where both the concentration and potential fields are coupled, e.g., systems with features comparable in size to the diffusion layer thickness.