Porous Electrode Coupling
Use this node to add a molar source in a domain that is coupled to one or multiple Porous Electrode Reaction nodes of an Electrochemistry Interface.
The molar source is calculated from the number of electrons, stoichiometric coefficients, and volumetric current densities of the coupled porous electrode reactions specified in the Reaction Coefficients subnodes.
In the Transport of Concentrated Species interface, the molar sources (or sinks) are multiplied by the species molar masses to obtain the corresponding mass sources.
Additional Reaction Coefficients subnodes are available from the context menu (right-click the parent node) as well as from the Physics toolbar, Attributes menu.
Note that if you are also modeling the momentum transport and expect a nonnegligible total mass source or sink, which is often the case in gas diffusion electrodes, you need to also add a corresponding Porous Electrode Coupling node in the Fluid Flow interface.
This feature is only available in a limited set of add-on products. See https://www.comsol.com/products/specifications/ for more details on availability.