The H2 Gas Diffusion Electrode and O2 Gas Diffusion Electrode nodes specify three phase domains where an Electronic Conducting Phase, an Electrolyte Phase, and a Gas Phase node are all active.

The effective electronic conductivity, Effective electrical conductivity, σs (SI unit: S/m) parameter will define how the electric current in the corresponding Electronic Conducting Phase domain depends on the gradient of the potential.

The bulk electrolyte conductivity defined in the Electrolyte Phase node will be multiplied by a correction factor to compensate for the effect of the Electrolyte volume fraction being less than 1. This can be done by either using a Bruggeman, Tortuosity, or User defined correlation.

This section will only be visible if the Include gas phase diffusion check box or the Use Darcy’s law for momentum transport check box has been selected in the corresponding Gas Mixture section on the interface top node.

If the Include gas phase diffusion check box has been selected, the gas diffusivity defined in the Gas Phase node will be multiplied by a correction factor to compensate for the effect of the Gas pore volume fraction being less than 1. This can be done by either using a Bruggeman, Tortuosity, or User defined correlation.

If the Use Darcy’s law for momentum transport check box has been selected, the Gas permeability is defined in this node.