The Porous Electrode Reaction node defines the electrode kinetics for a charge transfer reaction that occurs at the interface between the electrolyte and the electrode matrix in a porous electrode. The node can be added as a subnode to a Highly Conductive Porous Electrode node. Add multiple nodes to the same Highly Conductive Porous Electrode node to model multiple reactions, for instance in mixed potential problems.

See the Electrode Reaction node for a description of the Equilibrium Potential, Electrode Kinetics, Stoichiometric Coefficients, and Heat of Reaction sections.

The Active Specific Surface Area, av (SI unit: m2/m3) specifies the area of the electrode-electrolyte interface that is catalytically active for this porous electrode reaction. av is multiplied by iloc, defined in the Electrode Kinetics section, to produce a current source in the domain. The default value is 106 1/m.