Hexyl quaternary ammonium- and fluorobenzoyl-grafted SEBS as hydrophilic-hydrophobic comb-type anion exchange membranes
- Al Munsur, Abu Zafar; Lee, Junghwa; Chae, Ji Eon; Kim, Hyoung-Juhn; Park, Chi Hoon; Nam, Sang Yong; Kim, Tae-Hyun
- Issue Date
- Anion exchange membranes; Hydrophilic-hydrophobic comb-type; Hydrophobic fluorinated side-chain; Phase-separation; Enhanced conductivity
- JOURNAL OF MEMBRANE SCIENCE, v.643
- Journal Title
- JOURNAL OF MEMBRANE SCIENCE
- The new hydrophilic-hydrophobic comb-type anion exchange membrane (AEM) was prepared from SEBS grafted with hexyl quaternary ammonium (HQA) and fluorobenzoyl. As confirmed by XRD and TEM, a better phase separation was obtained by adding a highly hydrophobic fluorine-substituted pendant as an enhanced hydrophobic spacer to the conducting head group (which contained a hexyl spacer as a hydrophilic unit). The HQA-F1-SEBS and HQA-F5-SEBS membranes, with fluorobenzoyl and pentafluorobenzoyl pendants, respectively, showed enhanced hydrophobicity compared to their non-fluorinated counterpart (HQA-SEBS). The highest hydroxide ion conductivity (87.0 in water and 14.37 mS cm(-1) at 95% RH) was obtained at 80 degrees C with HQA-F5-SEBS, which exhibited the most thermodynamic incompatibility between hydrophilic and hydrophobic units. The mechanical properties (tensile strength and Young's Modulus) of the HQA-F5-SEBS membrane were also improved; they were almost 2.5 times higher than those of the HQA-SEBS. The HQA-F5-SEBS showed a current density of 500 mA cm(-2) at a potential of 0.6 V and a peak power density of 354 mW cm(-2). It also showed stable-cell durability for up to 100 h. Compared with the typical hydrophilic comb-type SEBS membrane and the previously reported SEBSbased AEM, its cell performance was significantly higher.
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- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
- 융합기술공과대학 > Department of Energy Engineering > Journal Articles
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