The Edge Electrode can be used in 3D problems to define electrodes such as long pipes and thin wires where the electric potential variation within the electrode in the normal direction to the electrode surface is negligible. This assumption allows for the thin electrode domain to be replaced by a lumped one-dimensional partial differential equation formulation on the edge, describing an electrode surface along the edge with a given
Edge electrode radius. In this way the problem size can be reduced, and potential problems with mesh anisotropy in the thin layer can be avoided.
The electric current conduction in the tangential direction of an edge can be described by Ohm’s law or a
Fixed electric potential or a
Floating potential assuming infinite conductivity of the edge or an
External short electric potential which allows to connect two electrodes over an external connector with a given bulk resistance.
A default Electrode Reaction subnode is added by default to the feature.
Double Layer Capacitance,
Electric Ground,
Electric Potential, and
Electrode Current subnodes can also be added to the feature.
Use the Add (
) and
Delete (
) buttons as needed in the tables to control the number of species.
Dependent variables for the molar concentration (mol/m) are added for each dissolving-depositing species. These variables can be used to keep track of the amount of reacted material on the electrode. The total molar dissolution/deposition rate depends on the reaction rates and stoichiometry, defined in the
Electrode Reaction sub nodes.
The Density and
Molar mass determine the electrode growth velocity and the resulting dissolved/deposited layer thickness, so that the change in the edge electrode radius also can be calculated. By use of the
Add volume change to edge radius check box you may define if this volume change should be included in the model.
See the Electrode Surface node. The section is only available when a
Secondary current distribution has been selected on the parent node.
) and select