Morphological Characteristics of Catalyst Layer Defects in Catalyst-Coated Membranes in PEM Fuel Cells

Catalyst layer defects and irregularities in catalyst-coated membrane (CCM) electrodes affect the lifetime of polymer electrolyte fuel cells (PEMFCs) during their operation. Thus, catalyst are important concerns for cell manufacturers prompt development quality control systems with aim fabricating defect-free electrodes. Consequently, objective this study is to gain a fundamental understanding morphological changes real that have developed CCM production. In paper, missing (MCLD) formed decal transfer process investigated through nondestructive method using reflected light microscopy. The geometric features quantified, growth measured at regular time intervals from beginning-of-life (BOL) end-of-life (EOL) until OCV has dropped by 20% its initial value as per DOE-designed protocol. Overall, two types degradation observed: surface caused erosion crack mechanical deformation. Furthermore, were found exhibit higher rate middle-of-life (MOL-1) stabilize EOL. This type will provide baseline information allow them select reject CCMs, ultimately increasing stacks.