Preparation of bipolar membranes (I)

Abstract

ABSTRACT:The bipolar membranes were prepared by charged material of polysulfone as a base. The bipolar membranes were composed of a solvent-resistant anion exchange layer with a crosslinking matrix prepared by the reaction of chloromethylated polysulfone in DMF with diamine, an interfacial layer made from chloromethylated polysulfone solution in DMF containing cation exchange resin and amine, and a cation exchange layer made from sulfonated polysulfone dispersing cation resin powder. The prepared bipolar membrane can exhibit lower voltage drop over 100 mA/cm 2 . The critical requirement for producing bipolar membranes of low potential drop is the creation of a thin interfacial region with a low electrical resistance and a suitable chemical structure, which act to catalyze water splitting.

Ion exchange membranes: State of their development and perspective

“…Therefore, the most crucial aspect of these applications is the bipolar membrane itself. For preparing such membranes, various methods has been initiated, such as preparing directly from commercial cation and anion exchange membranes by adhering with heat and pressure or with an adhesive paste [145], preparing by casting a cation exchange polyelectrolyte solution (or an anion exchange polyelectrolyte solution) on a commercial anion exchange membrane (or on a cation exchange membrane) respectively [146,147], or preparing from the same base membrane by simultaneous functionalizing at the two membrane sides [148][149][150][151] or selectively functionalizing on one side to give cation selectivity and on the other side to give anion selectivity, etc. [152].…”

Preparation and characterization of bipolar membranes modified by cystine-modified TiO2 visible-light photocatalyst

“…In general, a good membrane is one with low energy consumption, high current efficiency, high product purity, and good long-term stability [7]. The energy required by a commercially available BPM to produce hydroxide ions and protons should correspond very closely to the theoretical potential drop.…”

Preparation and characterization of bipolar membranes modified using photocatalyst nano‐TiO2 and nano‐ZnO

“…Recently, more and more attention has been paid to modification of cation layer or anion layer, and introduction of catalytic interlayer to promote water splitting. 11 Simons found that water splitting of a BPM was promoted when the cation or anion layer was coated with one or more suitable inorganic electrolyte such as sodium metasilicate, chromic nitrate, ruthenium trichloride, or indium sulfate. 12 Xu et al prepared the anion layers with different ammonium groups by reacting the bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) with different amines, and then the corresponding BPMs were prepared by casting the sulfonated poly(phenylene oxide) (PPO) solution on these anion exchange layers.…”