Ligand effects in metallopolymers as ion exchange membranes

Ion-exchange membranes are key components in numerous energy-storage devices. Their goals include separation between the cathode and anode, ion transport, fuel separation and deterrence of impurities. Several inorganic (such as ceramics), as well as organic polymeric membranes, have been developed and studied, but they each present limitations. Alternatively, metallopolymers can offer the best of both worlds - excellent mechanical properties and stable ionic species for transportation. In the last decade, the synthesis of metallopolymers has skyrocketed and their advantages have been demonstrated in different materials applications such as water purification, sensors, light-emitting devices and even some energy-related uses, such as solar cells. Here, we fine-tune these membranes for maximum chemical stability, envisioning anion-exchange membranes for fuel cells by combination of organic polymer backbone with excellent mechanical properties and the inorganic component that provides stable ionic species for ion transportation.