Abstract
The advancement of ion-exchange membranes (IEMs) with heightened permselectivity for specific ions is pivotal for improving electro-membrane processes. Achieving targeted ion selectivity necessitates precise control over membrane surface characteristics, including electrostatic forces, ion transport channel size, and hydrophobicity. Utilization of diverse nanostructured materials, particularly metal-organic frameworks (MOFs), offers a pathway to modify these surface properties. MOFs, known for their structural diversity, adjustable pore sizes, and customizable frameworks, are widely applied in separation, catalysis, electrochemical, and biomedical fields. This study presents novel composite membranes, enhanced with various nanostructured materials including MOFs, demonstrating improved specific ion selectivity, robust physical strength, and superior electrochemical properties compared to standard commercial membranes. Notably, these membranes exhibit augmented performance in water-splitting electrodialysis for LiOH production, attributed to enhanced proton-blocking and monovalent ion permeability. This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MEST) (NRF-2022M3C1A3081178 and NRF-2022M3H4A4097521).
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