Quantifying Percolation Events in PEM Fuel Cell Using Synchrotron Radiography

摘要: Abstract The distribution of independent water clusters within the gas diffusion layer (GDL) is an important, yet poorly understood, characteristic polymer electrolyte membrane fuel cells. A better understanding these would provide ex-situ invasion experiments and two-phase models with a set validation criteria that currently absent from literature. Synchrotron based X-ray radiography was employed visualize liquid emerging cell GDL. Droplet formations, entitled “breakthrough” events originated either channel or landing regions number breakthrough in given area (breakthrough density) provides insight into size evolving Water were found under flow field landings more frequently than channels. Each 1 mm 2 projected GDL to have 1-2 individual during most conditions studied, regardless substrate MPL type. existence percolating channels depended on combination type operating employed.