The in-situ resistance of Nafion~(circle R) membranes with different thickness was measured in H_2/O_2 fuel cells as function of current density and gas humidity. The resistance distribution across the thickness of membranes was determined by using membranes composed from several thin sheets with interlaying thin gold wires as potential probes. The same method was used to measure the resistance at different in-plane locations (i.e. at gas inlets and outlets). It was found that with increasing current density the resistance at the anode side of the membrane is increasing. When oxygen was fed dry, then complex in-plane patterns of membrane hydration distribution were observed.
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