Abstract
In proton exchange membrane fuel cells (PEMFCs), appropriate water management is critical to achieve high power density operation with increased robustness. For this purpose, soft X-ray radiography has been used in this study because it has been proved to be a powerful incitement for observing liquid water in PEMFCs. In this study, we focused our attention on micro porous layers (MPLs) with vapor growth carbon fiber (VGCF) impregnated in the MEA. In the experiment, we fabricated VGCF MPL coated on gas diffusion substrate (SIGRACET® 24BA). We also used commercial gas diffusion layer (SIGRACET® 24BC) for comparison. In situ visualization of liquid water distribution in both MEAs by soft X-ray radiography clearly shows their difference. The water tends to accumulate both at GDS and MPL for 24BC; the water tends to accumulate at GDS for VGCF.
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