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Effect of Polymer Architecture on the Nanophase Segregation, Ionic Conductivity, and Electro-Osmotic Drag of Anion Exchange Membranes

Anion exchange membranes (AEMs) are considered an attractive alternative to proton exchange membranes in fuel cell applications because they can operate with nonprecious metal electrodes. However, widespread adoption of AEMs has been hampered by their insufficient ionic conductivity. Much of the growing body of research on AEMs focuses on designing new polymer chemistries and architectures that would increase their conductivity, while controlling the swelling of the membrane. It is, however, challenging to assess the separate effects of water content and polymer architecture on the phase segregation and molecular transport of the ions and water in the membrane because changes in the chemistry of the polymer also impact the equilibrium water uptake. Here, we use large-scale molecular simulations to study the distinct effects of water content and ionomer architecture on the nanophase segregation, anion and water diffusivity, ion conductivity, and water electro-osmotic drag coefficient of anion exchange memb...