Journal
POLYMERS
Volume 13, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/polym13111874
Keywords
ionomers; ormosils; diffusion dialysis; fuel cells; redox flow batteries; electrodialysis
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This review summarizes the literature on composite anion exchange membranes containing an organo-silica network formed by sol-gel chemistry, discussing their key requirements and potential future research directions in various applications.
This short review summarizes the literature on composite anion exchange membranes (AEM) containing an organo-silica network formed by sol-gel chemistry. The article covers AEM for diffusion dialysis (DD), for electrochemical energy technologies including fuel cells and redox flow batteries, and for electrodialysis. By applying a vast variety of organically modified silica compounds (ORMOSIL), many composite AEM reported in the last 15 years are based on poly (vinylalcohol) (PVA) or poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) used as polymer matrix. The most stringent requirements are high permselectivity and water flux for DD membranes, while high ionic conductivity is essential for electrochemical applications. Furthermore, the alkaline stability of AEM for fuel cell applications remains a challenging problem that is not yet solved. Possible future topics of investigation on composite AEM containing an organo-silica network are also discussed.
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