Effect of Radical-Mediated Cross-Linking on Partially Fluorinated Aromatic Anion Exchange Membranes and their Applications in Alkaline Water Electrolysis Cells

Ahmed Mohamed Ahmed Mahmoud, Kenji Miyatake*, Fanghua Liu, Vikrant Yadav, Lin Guo, Chun Yik Wong, Toshio Iwataki, Katsuyoshi Kakinuma, Makoto Uchida

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

To investigate the effect of cross-linking on partially fluorinated anion exchange membranes tethered with trimethylpropyl side chains (QPAF-C3), styrene-based cross-linker is introduced into the precursor copolymers and then cross-linked via free radical reaction. The one-pot cross-linking and quaternization reactions are successful as confirmed through nuclear magnetic resonance spectra. By solution casting, the resulting polymers provide flexible membranes (xQPAF-C3-VB) with 9.1–36.0% degree of cross-linking. The cross-linking results in smaller hydrophilic/hydrophobic phase-separated morphology as confirmed by transmission electron microscopy images. The cross-linking effect on the membrane properties is observed in the suppressed water uptake and decreased hydroxide ion conductivity. Among the cross-linked membranes, xQPAF-C3-VB membranes with 17.4% degree of cross-linking and 1.16 meq g−1 of ion exchange capacity exhibit the highest hydroxide ion conductivity (56 mS cm−1 at 30 °C) that is comparable to that of the pristine membrane (54 mS cm−1). The cross-linking contributes to improving the thermomechanical properties with higher glass transition temperature. The cross-linked xQPAF-C3-VB is applied to alkaline water electrolyzer to achieve high efficiency (74%) and reasonable performance (1.67 V at 1.0 A cm−2).

本文言語English
論文番号2300236
ジャーナルAdvanced Energy and Sustainability Research
5
3
DOI
出版ステータスPublished - 2024 3月

ASJC Scopus subject areas

  • エネルギー工学および電力技術
  • 生態学
  • 廃棄物管理と処理
  • 環境科学(その他)

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