Abstract
To alleviate water flooding in cathode electrodes of polymer electrolyte fuel cells (PEFCs), the modified electrode/channel structure with electrode perforation and channel hydrophilization has been proposed. This study investigated the liquid water distribution in the modified electrode with penetration grooves of an operating PEFC using X-ray imaging, and evaluated the effect of groove size on the water removal inside the electrode. The influence of the combinational electrode/channel structure on the cell performance was also demonstrated by the constant-current operation test. It was noted that the electrode perforation effectively reduces the water accumulation in the cathode GDL. An increase in the groove width enhances the in-plane water discharge towards the large groove. The combinational structure with electrode perforation and channel hydrophilization improves the limiting current density due to the positive through-plane water removal from the porous media to the flow channel.
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