Silica Containing Composite Anion Exchange Membranes by Sol–Gel Synthesis: A Short Review

Emanuela Sgreccia (1) , Riccardo Narducci (1) , Philippe Knauth (2) , Maria Di Vona (1)

1 Università degli Studi di Roma Tor Vergata [Roma] = University of Rome Tor Vergata
2 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie

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.

Mots clés: ionomers; ormosils; diffusion dialysis; fuel cells; redox flow batteries; electrodialysis

Domaines: Chimie

Emanuela Sgreccia, Riccardo Narducci, Philippe Knauth, Maria Di Vona. Silica Containing Composite Anion Exchange Membranes by Sol–Gel Synthesis: A Short Review. Polymers, 2021, 13, ⟨10.3390/polym13111874⟩. ⟨hal-03664177⟩