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Anion exchange membranes based on poly(oxindole biphenylene) grafted with hydroxyl and quaternary ammonium groups for alkaline water electrolysis

Peng, Zhen ; Liu, Xinyi ; Wang, Qian ; Zhao, Yun ; Jannasch, Patric LU orcid and Yang, Jingshuai LU (2025) In Materials Today Chemistry 44.
Abstract
Utilizing green hydrogen produced by water electrolysis offers a viable
strategy to mitigate the global energy crisis. In the present work, a
high-performance, readily synthesized, and cost-effective anion exchange
membrane (AEM) for alkaline water electrolyzers has been developed and
studied. Glycidyl trimethyl ammonium chloride (GTA) was grafted onto
poly(oxindole biphenylene) (POB) through an efficient and
environmentally friendly ring-opening reaction without the use of any
catalyst. The resulting side chains, containing alkyltrimethylammonium
cations with hydroxyl groups in the β-position of the cationic center,
improved both the microphase separation and OH− conductivity of the... (More)
Utilizing green hydrogen produced by water electrolysis offers a viable
strategy to mitigate the global energy crisis. In the present work, a
high-performance, readily synthesized, and cost-effective anion exchange
membrane (AEM) for alkaline water electrolyzers has been developed and
studied. Glycidyl trimethyl ammonium chloride (GTA) was grafted onto
poly(oxindole biphenylene) (POB) through an efficient and
environmentally friendly ring-opening reaction without the use of any
catalyst. The resulting side chains, containing alkyltrimethylammonium
cations with hydroxyl groups in the β-position of the cationic center,
improved both the microphase separation and OH− conductivity of the AEM. The fully grafted POB reached an impressive OH− conductivity of 108 mS cm−1 at 80 °C. An AEM water electrolysis (AEMWE) cell assembled with this AEM achieved a high current density of 4.7 A cm−2
at 2 V and 80 °C. After 350 h of lifetime testing the AEM suffered
mechanical damage, which led to the sudden failure of the AEMWE. This
indicated that improving the mechanical strength of the AEM is the key
factor for enhancing AEMWE durability in the future. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Materials Today Chemistry
volume
44
article number
102579
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85217208399
ISSN
2468-5194
DOI
10.1016/j.mtchem.2025.102579
language
English
LU publication?
yes
id
20e93abf-1d9d-4b30-9ec6-ee616b8dba1d
date added to LUP
2024-09-08 12:07:58
date last changed
2025-04-04 14:49:41
@article{20e93abf-1d9d-4b30-9ec6-ee616b8dba1d,
  abstract     = {{Utilizing green hydrogen produced by water electrolysis offers a viable <br>
strategy to mitigate the global energy crisis. In the present work, a <br>
high-performance, readily synthesized, and cost-effective anion exchange<br>
 membrane (AEM) for alkaline water electrolyzers has been developed and <br>
studied. Glycidyl trimethyl ammonium chloride (GTA) was grafted onto <br>
poly(oxindole biphenylene) (POB) through an efficient and <br>
environmentally friendly ring-opening reaction without the use of any <br>
catalyst. The resulting side chains, containing alkyltrimethylammonium <br>
cations with hydroxyl groups in the β-position of the cationic center, <br>
improved both the microphase separation and OH<sup>−</sup> conductivity of the AEM. The fully grafted POB reached an impressive OH<sup>−</sup> conductivity of 108 mS cm<sup>−1</sup> at 80 °C. An AEM water electrolysis (AEMWE) cell assembled with this AEM achieved a high current density of 4.7 A cm<sup>−2</sup><br>
 at 2 V and 80 °C. After 350 h of lifetime testing the AEM suffered <br>
mechanical damage, which led to the sudden failure of the AEMWE. This <br>
indicated that improving the mechanical strength of the AEM is the key <br>
factor for enhancing AEMWE durability in the future.}},
  author       = {{Peng, Zhen and Liu, Xinyi and Wang, Qian and Zhao, Yun and Jannasch, Patric and Yang, Jingshuai}},
  issn         = {{2468-5194}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Materials Today Chemistry}},
  title        = {{Anion exchange membranes based on poly(oxindole biphenylene) grafted with hydroxyl and quaternary ammonium groups for alkaline water electrolysis}},
  url          = {{http://dx.doi.org/10.1016/j.mtchem.2025.102579}},
  doi          = {{10.1016/j.mtchem.2025.102579}},
  volume       = {{44}},
  year         = {{2025}},
}