Porous Electrode
The Porous Electrode node sets up charge balances for the electrode and the pore electrolyte in a porous electrode, and as well as the mass balance for the species in the electrolyte.
Note that the node should be used for porous domains that conduct current in both an electrolyte and an electrode phase. For the case of domains that do not contain a pore electrolyte — for instance, the gas diffusion layer (GDL) in a PEMFC electrode — use an Electrode node instead.
Use Porous Electrode Reaction child nodes to define the charge transfer reactions that occur on the interface between the electrolyte and electrode phases within the porous electrode. The Porous Matrix Double Layer Capacitance subnode is also available.
See the Electrolyte node for more information about the Diffusion and Migration in Electric Field settings of this node.
Correction factors may be specified in the Effective Transport Parameter Correction section to account for the lowered effective conductivities of the electrode and electrolyte phases due to the lower volume fractions of each phase, and the tortuosity of the porous matrix.
The Electrode volume fraction is used to calculate the effective electrical conductivity of the porous matrix when the correction factor is set to Bruggeman or Tortuosity. Additionally, it is used in calculating the active specific surface area of the porous matrix when Particle-based area option is selected in the child nodes.
Dissolving-Depositing Species
See the Porous Electrode node of The Primary and Secondary Current Distribution Interfaces
Film Resistance
See the Electrode Surface node.
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Porous Electrode Theory
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Porous Electrode Reactions Theory
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Domain Equations for Tertiary Current Distributions Using the Nernst-Planck Equations and Electroneutrality