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The effects of structure, chemistry, and morphology of an anion exchange membrane (AEM) for separation of CO 2  from a humidified gas mixture were characterized to determine the influence on the kinetics and transport properties of a membrane electrode assembly (MEA). Supported and unsupported membranes with thicknesses of 30 µm and 50 µm were used to determine through-plane resistance, ion transport capacity, and gas diffusion properties. The effects of membrane saturation on the membrane resistance was characterized by impedance measurements under conditions with varying relative humidity from 0% to 100%. Permeability measurements with varying CO 2  concentration from 1% CO 2  to 10% CO 2  at temperatures of 25°C and 35°C determined changes in the membrane behavior, which could influence the performance of the CO 2  separating MEA. This study characterized how AEM properties influence the behavior and performance of an electrochemical separating CO 2  MEA suitable for high-humidity, low CO 2  concentration environments. Pt and IrO 2  electrodes were used evaluate the performance of unsupported and supported membranes within a MEA, characterized by electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and constant-current measurements to examine the CO 2  electromigration.

Effects of structure and chemistry on electrochemical transport properties of anion exchange membranes for separation of CO 2