Use the Electrode Surface node to model an electrochemical electrode-electrolyte interface between an electrolyte domain and an electrode boundary where the electrode is not included explicitly as a domain in the model geometry.

Use the Harmonic Perturbation section in conjunction with AC Impedance study types to control the perturbation amplitude in the frequency domain. The perturbation parameter is either Electric potential or Total current based on the Electrode phase potential condition selected in the next section.

This section specifies the potential in the electrode phase of the electrolyte-electrode interface. The electrode potential is used (via the overpotential) by the Electrode Reaction subnodes.

Use the Electric potential option (default) to set the value of the potential explicitly with respect to ground. The other option, Total current, adds an extra global degree of freedom for the potential in the electrode phase, set to comply with the chosen condition. When using the Total current option in 1D or 2D, the boundary area is based either on the Cross-Sectional Area (1D), or the Out-of-Plane Thickness (2D) properties, set on the physics interface top node.

The Density of sites parameter will be used to set up the local surface mass balance equations for the fractional surface coverages.

Use the Add () and Delete () buttons as needed in the table to control the number of species. The name of each adsorbing–desorbing Species can be edited in the first column of the table.

The Stoichiometric Coefficients section in the Electrode Reaction and Reaction subnodes is used to set the stoichiometric coefficients for adsorbing–desorbing species reaction.