Anion Exchange Membranes Synthesized by Acetalization of Poly(vinyl alcohol) for Fuel Cells

Abstract

High-performance anion exchange membranes (AEMs) are the bottleneck of the commercialization of alkaline AEM fuel cells. Various methods have been developed to prepare AEMs with high ionic conductivity, excellent mechanical properties, and alkaline stability. Among them, modification of various commercial polymers is a facile and effective way. To broaden the category of the commercial polymer-based AEMs, herein, a series of AEMs based on poly­(vinyl alcohol) were prepared by acetalization. The PVA–FBMP x –TPA z membrane achieved OH– conductivity up to 200.4 mS cm–1 at 80 °C with appropriate water uptake and a low swelling ratio. Moreover, a high peak power density of 982 mW cm–2 was obtained in a H2/O2 fuel cell test.

Synergistic functionalization of poly(p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations for fuel cells

“…As the content of branched chains increases, the unit volume of the molecular chain increases, increasing the water uptake of the AEMs, which weakens the interaction of the polymer backbone and leads to a decrease in tensile strength. 55–57 All PTI-N- n membranes showed suitable tensile strength, which proves the good prospect of poly( p -terphenyl isatin) as the skeleton of anion exchange membrane (Table 2).…”

Novel Hydrophobic Covalent Cross-Linking Poly(terphenyl Isatin Piperidinium) with Poly(triphenylpyridine) for Anion Exchange Membranes

“…BIN monomer, whose synthetic route is shown in Figure S1, is the N-alkylation of isatin by the reaction of dibromo hexane with isatin. The BIN was characterized by 1 shown in Figure S2. The proton peaks of the methylene group next to Br (H10) and the adjacent N-methylene group (H5) are displayed at 3.77 and 3.41 ppm, respectively.…”

Construction of Cross-Linked Poly(aryl Ether Nitrile) Anion Exchange Membranes Containing Bilateral Linked Branches for Water Electrolyzer

“…The structure of CS-G-PAENA-50 provided a multitude of ion transport channels, facilitating efficient ion transport and enabling high conductivity of the membrane. 39,40 The domain spacing of the AEMs was further investigated by SAXS experiments to elucidate the presence of ion clusters. A more pronounced scattering peak indicated a denser arrangement of hydrophilic groups within the membrane and also suggested a larger spacing between ionic conductive channels.…”