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High Resolution Neutron Radiography Imaging of Operating PEM Fuel Cells: Effect of Flow Configuration and Gravity on Water Distribution

Neutron radiography, performed in situ within an operating PEMFC, is a powerful tool in developing greater understanding of water distribution profiles during cell operation. In particular, the ability to simultaneously correlate water distribution with cell operating conditions and cell performance provides a degree of understanding of water management that is not available with any other existing technique. High resolution imaging of through plane water profiles using a Micro-Channel Plate (MCP) detector with 25 m resolution produces water profile images in which one can readily distinguish between water in anode and cathode gas diffusion layers (GDLs), as well as between water in the GDLs above channels and above lands, and water in the channels themselves.