Abstract
Kinetic and mass transport properties were investigated for the oxygen reduction reaction in Nafion® 117 and a sulfonated poly (arylene ether sulfone) membrane (SPES-40) at 100% relative humidity (RH) as a function of pressure and temperature using a solid-state electrochemical cell. Kinetic parameters were obtained using slow-sweep voltammetry while mass transport parameters, the diffusion coefficient (D) and solubility (C), were obtained using chronoamperometry at a Pt/proton exchange membrane (PEM) interface. Oxygen reduction kinetics was found to be similar for both Nafion® 117 and SPES-40 membrane at the Pt microelectrode (100 μm) interface. The temperature dependence of O2 permeation parameters showed similar trends for both the membranes while the pressure dependence of O2 permeation parameters showed major differences. Despite lower equivalent weight and hence higher water content SPES-40 exhibited relatively lower values of D with Nafion® 117. The results are discussed in the context of their different microstructures.
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