The Effect of PFSA Membrane Compression on the Predicted Performance of a High Pressure PEM Electrolysis Cell
In this work, a non-equilibrium formulation of the water uptake model by Kusoglu et al.  has been implemented in a two-dimensional, two-phase, multi-component and non-isothermal PEM electrolysis model. The non-equilibrium formulation of the water uptake model was chosen in order to account for interfacial transport kinetics between each fluid phase and the PFSA membrane. Besides modeling water uptake, the devised membrane model accounts for water transport through diffusion and electro-osmotic drag in the polymer phase, and hydraulic permeation in the liquid phase. Charge transport and Butler-Volmer electrochemistry are likewise included.
In order to investigate the effect of accounting for membrane compression, a parametric study is carried out with and without the compression corrected water uptake model by Kusoglu et al. . The obtained simulation results confirm and underline that the predicted water uptake and cell voltage are highly dependent on the applied water uptake model.
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