Electrode-Electrolyte Boundary Interface
Note that this is an advanced physics feature that is normally not used. To display this feature in the context menu, click the Show More Options button () and then select Advanced Physics Options in the Show More Options dialog box. Then add the Electrode-Electrolyte Boundary Interface node from the Electrode or Pairs>Electrode submenu.
Use this node to model an electrochemical interface between an electrolyte and an electrode where the electrolyte domain is not included explicitly in the model. The node can only be applied on outer boundaries to electrode domains. Set the potential of the electrolyte either explicitly, or specify a current condition that the potential of the electrode shall fulfill.
Electrode Reaction and Double-Layer Capacitance subnodes are available from the context menu (right-click the parent node) or from the Physics toolbar, Attributes menu.
This node is available for the Secondary Current Distribution and Tertiary Current Distribution, Nernst–Planck interfaces.
Boundary Condition
This section specifies the potential of the electrolyte phase for the electrolyte-electrode interface. The electrolyte potential is used (via the overpotential) by the Electrode Reaction subnodes.
The Electrolyte potential will set the potential value directly, whereas Total current or Average current density both add an extra global degree of freedom for the potential in the electrolyte 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.