Polymer electrolyte membrane resistance model

Poroelectroelastic theory of water sorption and swelling in polymer electrolyte membranes

“…This example supports the idea that hydraulic water flux, generated in response to externally applied RH differences or by internal variations in water content due to electro-osmotic drag, could constitute the major mechanism to control the water balance in PEM under PEFC operation. 5,12,67 The trends in water sorption behaviour predicted in Fig. 8(b)-(d) are consistent with experimental observations, e.g., those reported in ref.…”

“…However, the insensitivity of water sorption and swelling to P g cannot be used as a justification for neglecting pressure driven flux mechanisms in models of PEM operation. 5,12,13,15,67 Small variations in P v /P s cause large variations in internal liquid pressures in pores, establishing substantial driving forces for hydraulic water fluxes. Using the reference case parameters for a simple demonstration, liquid pressures at P v /P s ¼ 0.95 (DV/V 0 ¼ 0.34) and P v /P s ¼ 0.80 (DV/V 0 ¼ 0.23) are P l ¼ À67 bar and À304 bar, respectively, establishing a driving force for hydraulic permeation of DP l x 250 bar from the high to the low RH region.…”

Statistical analysis of the effect of temperature and inlet humidities on the parameters of a semiempirical model of the internal resistance of a polymer electrolyte membrane fuel cell

“…A large variety of PEM resistance models can be found in literature [26]. These models can be classified in two main types: microscopic and macroscopic models.…”

Physical Modeling of Materials for PEFCs: A Balancing Act of Water and Complex Morphologies

“…Recently, it was shown that the hydraulic permeation model could explain the response of the membrane performance to variations in external gas pressures in operating fuel cells. 215 The experimental data (dots) are reproduced very well within the framework of the hydraulic permeation model (solid lines). For the basic case with zero gas pressure gradient between cathode and anode sides, ∆P g = 0, the model (solid line) predicts uniform water distribution and constant membrane resistance at j p < 1 A cm -2 and a steep increase in R/R s beyond this point.…”

“…15 shows data for the PEM resistance in an operational PEFC, to the resistance of the uniformly saturated membrane (at open circuit conditions), R s = L PEM /s p (l max ), for various applied gas pressures in anode and cathode compartments (from Renganathan et al215 ).…”