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This tutorial demonstrates how to modify a concentration-independent (also known as a secondary current distribution) liquid alkaline water electrolyzer with concentrated electrolyte theory to explicitly resolve local electrolyte and solvent concentrations (thereby creating a tertiary current distribution). A liquid alkaline electrolyzer is defined in a 2D model with a separator, two gas-electrolyte compartments, and negative hydrogen and positive oxygen electrodes at the boundaries. A stationary solver is used with the cell voltage swept over a range of potentials to generate a polarization curve.

The model is first solved for a secondary current distribution only. Concentrated electrolyte theory is then added and the cell performance is compared between the secondary and tertiary current distribution cases.