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Photograph of the fuel cell hardware for measuring water sorption in Nafion at the NIST neutron imaging facility. Active area (i.e., the membrane region exposed to the humidified gas flow in sorption experiments), denoted by the GDL, is 2.5 cm2, with the width of 12 mm (in the beam direction). The membrane extends across the entire face of the plate and is compressed by the gaskets outside of the active area.
