Use the Reactions node to define non-electrochemical reactions in an electrolyte domain.

The node is found from the Additional Sources submenu

When specifying reaction rates in the Rc2 (SI unit: mol/m3·s) fields for a species in a Porous Electrode domain, the specified reaction rate expression may either refer to the total volume or the pore (electrolyte) volume. For non-porous domains the settings of the Reacting Volume section has no impact.

For Total volume the reaction expressions are used as specified (multiplied by unity).

For Pore volume this results in the specified reaction expressions being multiplied by the domain electrolyte volume fraction εl. (εl equals unity for non-porous domains).