A facile approach to fabricate poly(2,6-dimethyl-1,4-phenylene oxide) based anion exchange membranes with extended alkaline stability and ion conductivity for fuel cell applications
- A facile approach to fabricate poly(2,6-dimethyl-1,4-phenylene oxide) based anion exchange membranes with extended alkaline stability and ion conductivity for fuel cell applications
- 김형준; Vijayalekshmi Vijayakumar; 손태양; 남상용
- Alkaline stability; Anion exchange membrane; Polyhedral oligomeric silsesquioxane; Quaternization
- Issue Date
- Journal of membrane science
- VOL 591, 117314
- An effective strategy to improve both the conductivity and alkaline stability of anion exchange membranes (AEMs) was proposed by incorporating quaternary ammonium functionalized polyhedral oligomeric silsesquioxane (QPOSS) into quaternized poly(2,6-dimethyl-1,4-phenylene oxide) (QPPO). Glycidyltrimethylammonium chloride (GTMAC) was used as the main quaternized reagent for the synthesis of QPOSS. The introduction of QPOSS provided the hybrid membranes with additional ion hopping sites and ion conducting channels. The QPPO-QPOSS membrane with high ion exchange capacity of 4.81 meq g− 1 possessed the hydroxide ion conductivity of 8.77  ×  10− 2 Scm− 1 at 80  °C. Meanwhile, the hybrid composite membranes showed enhanced alkaline stability due to the steric hindrance offered by QPPO and QPOSS and good alkaline resistance of long alkyl chain from octaammonium and glycidyl trimethyl ammonium bulky substituents. The residual ratio of hydroxide conductivity of QPPO-QPOSS-3 after being treated with 1  M KOH at room temperature for 1200  h reached 102%. The improved interfacial compatibility among the matrix polymer and filler imparted the hybrid membranes enhanced mechanical properties, good dimensional and thermal stability. The H2/O2 fuel cell using composite membrane of 3  wt% QPOSS relative to QPPO reached a maximum power density of about 288  mWcm− 2. The prepared hybrid membrane with promising characteristics exhibited the potential for applications in alkaline anion exchange membrane fuel cells in considering their integrative properties.
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