Effects of Gas Cross-over through the Membrane on Water Management in the Cathode and Anode Sides of PEM Fuel Cell

• Published in: Journal of Applied Fluid Mechanics 2018-07, Vol.11 (4), p.861-875
• Main Authors: Mohammadzadeh, K., Khaleghi, H., Khadem Abolfazli, H. R., Seddiq, M.
• Format: Article
• Language: English
• Subjects: Anode effect; Cathodes; Crossovers; Current density; Electrodes; Finite volume method; Fuel cells; Fuel technology; Gases; Membranes; Model accuracy; Numerical investigation; PEMFC; Water Management at the anode; Gas cross-over through the membrane; Proton exchange membrane fuel cells; Steady flow; Two dimensional flow; Two dimensional models; Water; Water management
• ISSN: 1735-3572; 1735-3645
• DOI: 10.29252/jafm.11.04.28559

Water management in a proton exchange membrane fuel cell (PEMFC) is numerically modeled by considering the 2D, non-isothermal steady flow assumptions. Governing equations are solved in all cell layers including cathode and anode electrodes by finite volume method using a single-region approach. The effect of gas cross-over through the membrane is studied on cell performance. This consideration, not only improves the general accuracy of modeling but also makes it possible to model energy losses due to direct reaction of reactant gases. The effect of some key variables such as liquid water diffusivity, current density, membrane thickness, etc. on PEMFC conditions such as the amount of saturated liquid water, power density, cell temperature, cross-over efficiency and so on are examined. It was observed that the amount of saturated liquid water on the anode side is considerably important. This observation addresses needs for further investigation of liquid water behavior in the anode electrode. The amount of liquid water saturation in both the cathode and anode electrodes is increased with increasing the current density. The results showed that at the current density of 0.2 A/cm2, cross-over effect causes about 10% reduction in cell efficiency and by decreasing the current density this effect is enhanced.