Abstract
An electrochemical method is developed for the measurement of the oxygen permeation rate through perfluorosulfonic acid (PFSA) membranes at various temperatures and relative humidities (RH) using a fuel cell setup. The oxygen permeability is determined from the oxygen-crossover-rate limited oxygen reduction reaction (ORR) current. The current vs. applied voltage relationship during the oxygen permeation rate measurement can be fully explained by a kinetic model accounting for the anode and cathode reactions, oxygen transport through the membrane, and oxygen diffusion from the cathode electrode to cathode flow channel. While demonstrated for a PFSA membrane, the presented electrochemical method to quantify the oxygen permeability is also applicable to any other types of proton or hydroxide conducting ionomeric membranes.
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