Abstract
The performance of polymer electrolyte fuel cells (PEFCs) depends on the structure of catalyst layer which is formed by coating catalyst ink. This study investigated the nanostructural formation of catalyst layer during ink drying process using time-resolved grazing-incidence small-angle X-ray scattering (GISAXS). GISAXS patterns measured for the catalyst ink coated with a 100 μm thickness on a silicon wafer suggest that Pt/C aggregation completed at drying time (t) of 250 sec although the ink was completely dried at t = 1600 sec. Thus, the Pt/C aggregate structure was mostly pinned in the early stage of the drying.
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