Influence of cracks in the microporous layer on the water distribution in a PEM fuel cell investigated by synchrotron radiography
Water evolution in the gas diffusion layer of a polymer electrolyte membrane fuel cell was visualized in situ by means of synchrotron X-ray radiography. Cracks in the microporous layer were identified as start points of efficient liquid water transfer paths through the gas diffusion layer. Quantitative analysis of the water flow rate through those arbitrarily distributed cracks into the gas channel revealed that they have a strong influence on the overall liquid water transport. This could find entry into future material design and simulation. In situ visualization of dynamic water distribution in the microporous layer of a PEMFCCracks in microporous layer strongly influence liquid water transport through GDL.Quantification of droplet volume yields liquid water flow rate through MPL cracks.