Poly(Arylene Alkylene)s with Tetrazole Pendants for Alkaline Ion-Solvating Polymer Electrolytes

Yifan Xia, Sinu C. Rajappan, Si Chen, Mikkel Rykær Kraglund, Dmytro Serhiichuk, Dong Pan, Jens Oluf Jensen, Patric Jannasch, David Aili*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Alkaline ion-solvating membranes derived from a tetrazole functionalized poly(arylene alkylene) are prepared, characterized and evaluated as electrode separators in alkaline water electrolysis. The base polymer, poly[[1,1′-biphenyl]-4,4′-diyl(1,1,1-trifluoropropan-2-yl)], is synthesized by superacid catalyzed polyhydroxyalkylation and subsequently functionalized with tetrazole pendants. After equilibration in aqueous KOH, the relatively acidic tetrazole pendants are deprotonated to form the corresponding potassium tetrazolides. The room temperature ion conductivity is found to peak at 19 mS cm−1 in 5 wt. % KOH, and slightly declines with increasing KOH concentration to 13 mS cm−1 in 30 wt. % KOH. Based on an overall assessment of the mechanical properties, conductivity and electrode activity, 30 wt. % KOH is applied for alkaline electrolysis cell tests. Current densities of up to 1000 mA cm−2 were reached with uncatalyzed Ni-foam electrodes at a cell voltage of less than 2.6 V, with improved gas barrier characteristics compared to that of the several times thicker Zirfon separator.

Original languageEnglish
Article numbere202400844
JournalChemSusChem
Volume17
Issue number23
Number of pages11
ISSN1864-5631
DOIs
Publication statusPublished - 2024

Keywords

  • Ion-solvating membrane
  • Alkaline water electrolysis
  • Polyhydroxyalkylation
  • Tetrazole functionalization
  • Conductivity

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