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Membrane/ionomer proton conductivity measurements

FIGURE 13.14 (a) Comparison between estimated proton conductivities on Pt whiskers and measured conductivities of the ionomer in a bulk membrane and in a conventional electrode with ionomer-to-carbon content of 0.97, at 80°C as a function of RH. For comparison, the conductivity of distilled water at 25°C is also shown, (b) ORR current density distributions across the (0.23- om-thick) NSTF cathode at i= with high stoichiometric flows of ECS. [Pg.305]

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