In fuel cell systems having water transport sheet (such as proton exchange membrane (PEM) based fuel cell systems), an aspect of the water transport sheet, i.e., the water transport sheet structure, is often critical for system performance. For example, the concentration of water vapor in air and the amount of water vapor in exhaust gas from a fuel cell stack degrade the performance of many components associated with the fuel cell system. Water vapor is typically generated within the PEM from reactions between the 50e0806aeb nerigius
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