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Composite Polymer Anion Exchange Membranes with Sandwich Structure and Improved Performance for Zn–Air Battery
- Source :
- Membranes, Vol 11, Iss 224, p 224 (2021), Membranes, Volume 11, Issue 3
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- In this study, we fabricated a composite polymer anion exchange membrane (AEM) with a sandwich structure. This prepared AEM demonstrated high ionic conductivity (0.25 Scm−1), excellent alkali resistance (8 M KOH), and good mechanical properties (tensile strength of 0.455 MPa and elongation at break of 82.13%). Here, degrease cotton (DC) treated with LiOH/urea aqueous solution was used and immersed into a coagulation bath to form a film. This film was immersed in acrylic acid (AA) monomers, and in-suit polymerization was carried out in the presence of KOH and an initiator. Finally, a composite polymer membrane with sandwich structure was achieved, in which the upper and bottom layers were mainly composed of polymerized AA (PAA) while the central layer was mainly composed of DC derived film. The central layer acted as a skeleton to improve the mechanical properties and alkali resistance. The top and bottom layers (PAA-rich layers) acted as OH- ion transport carriers, making basic cations migrate along the main chain of PAA. This newly developed composite membrane showed increased tensile strength and an elongation at break of 2.7 and 1.5 times, respectively, when compared to a control PAA/KOH AEM film. Furthermore, an electrochemical stability window of 2.0 V was measured via the cyclic voltammetry curve test, showing a wide electrochemical window and promising application in Zn–Air batteries.
- Subjects :
- anion exchange membranes
Materials science
Zn–Air battery
Filtration and Separation
02 engineering and technology
010402 general chemistry
lcsh:Chemical technology
01 natural sciences
Article
degrease cotton
Ultimate tensile strength
Chemical Engineering (miscellaneous)
Ionic conductivity
lcsh:TP1-1185
lcsh:Chemical engineering
Aqueous solution
Ion exchange
PAA
Process Chemistry and Technology
lcsh:TP155-156
alkaline solid polymer electrolyte
021001 nanoscience & nanotechnology
0104 chemical sciences
Membrane
Polymerization
Chemical engineering
Cyclic voltammetry
0210 nano-technology
Electrochemical window
Subjects
Details
- Language :
- English
- ISSN :
- 20770375
- Volume :
- 11
- Issue :
- 224
- Database :
- OpenAIRE
- Journal :
- Membranes
- Accession number :
- edsair.doi.dedup.....2e0943753ddd6a7bda4aa06cb86258f4