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The effects of the areal weight and thickness of the GDL of a polymer electrolyte fuel cell (PEFC) have been analyzed using a cell with hybrid gas channels that can arbitrarily change the ratio of the flow rates between the interdigitated and parallel flows. We clarify that a decrease in the areal weight of the GDL reduces the pressure loss in in-plane direction of the GDL owing to the enhanced exhaust of accumulatd product water in liquid phase. Increased pore diameter also contributes to reduce the flow resistivity. On the other hand, 30% increase in the thickness of the GDL decreases the cross-sectional area ratio of through-pores (A/A0) due to further flooding in the GDL, leading to the decrease in the pressure loss of about 70% of that expected. In both the cases, cell voltage fluctuation from the instability of the exhaust of the liquid water under the operation at high air utilization remains to be solved.

nihon kikai gakkai ronbunshū. b

Development of a PEFC with Parallel Hybrid Pattern Gas Channels (3rd Report, Effects of GDL Design Parameters on PEFC Performance in Interdigitated Gas Channels)