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Poly(arylene alkylene)s with Tetrazole Pendants for Alkaline Ion-Solvating Polymer Electrolyte

Xia, Yifan ; Rajappan, Sinu C. ; Chen, Si LU ; Kraglund, Mikkel Rykær ; Serhiichuk, Dmytro ; Pan, Dong LU ; Jensen, Jens Oluf ; Jannasch, Patric LU orcid and Aili, David (2024) In ChemSusChem 17(23).
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... (More)
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. (Less)
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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ChemSusChem
volume
17
issue
23
article number
e202400844
pages
11 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:39115117
  • scopus:85200668522
ISSN
1864-564X
DOI
10.1002/cssc.202400844
language
English
LU publication?
yes
id
74bd88b9-a737-46cb-aa40-c4b327f022b1
date added to LUP
2023-09-27 17:05:28
date last changed
2025-04-04 15:19:23
@article{74bd88b9-a737-46cb-aa40-c4b327f022b1,
  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<sup>−1</sup> in 5 wt. % KOH, and slightly declines with increasing KOH concentration to 13 mS cm<sup>−1</sup> 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<sup>−2</sup> 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.}},
  author       = {{Xia, Yifan and Rajappan, Sinu C. and Chen, Si and Kraglund, Mikkel Rykær and Serhiichuk, Dmytro and Pan, Dong and Jensen, Jens Oluf and Jannasch, Patric and Aili, David}},
  issn         = {{1864-564X}},
  language     = {{eng}},
  number       = {{23}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{ChemSusChem}},
  title        = {{Poly(arylene alkylene)s with Tetrazole Pendants for Alkaline Ion-Solvating Polymer Electrolyte}},
  url          = {{http://dx.doi.org/10.1002/cssc.202400844}},
  doi          = {{10.1002/cssc.202400844}},
  volume       = {{17}},
  year         = {{2024}},
}