Tetrazole-functionalized poly(oxindole biphenylene) ion-solvating membranes for alkaline water electrolysis
Xia, Yifan ; Rajappan, Sinu C. ; Kraglund, Mikkel Rykær ; Serhiichuk, Dmytro ; Pan, Dong LU ; Chen, Si LU ; Jensen, Jens Oluf ; Jannasch, Patric LU
and Aili, David
(2025)
In Journal of Power Sources
656.
- Abstract
- Poly(oxindole biphenylene) was functionalized with tetrazole pendants and evaluated as base material for alkaline ion-solvating membranes for water electrolysis. The poly(oxindole biphenylene) parent polymer was obtained by superacid catalyzed polyhydroxyalkylation and subsequently functionalized by cyanoalkylation. The cyanoalkyl groups were thereafter converted to tetrazole pendants by a click type [3 + 2] cycloaddition with sodium azide. The ion conductivity in 30 wt% KOH varied with the degree of functionalization, and reached 11 mS cm−1 at room temperature for the fully functionalized membrane. In water electrolysis tests, it supported current densities up to 800 mA cm−2 with uncatalyzed Ni-foam electrodes at a cell voltage of around... (More)
- Poly(oxindole biphenylene) was functionalized with tetrazole pendants and evaluated as base material for alkaline ion-solvating membranes for water electrolysis. The poly(oxindole biphenylene) parent polymer was obtained by superacid catalyzed polyhydroxyalkylation and subsequently functionalized by cyanoalkylation. The cyanoalkyl groups were thereafter converted to tetrazole pendants by a click type [3 + 2] cycloaddition with sodium azide. The ion conductivity in 30 wt% KOH varied with the degree of functionalization, and reached 11 mS cm−1 at room temperature for the fully functionalized membrane. In water electrolysis tests, it supported current densities up to 800 mA cm−2 with uncatalyzed Ni-foam electrodes at a cell voltage of around 2.6 V. After 330 h of electrolysis operation at 80 °C in 30 wt% KOH, and 500 h cell test in total, FTIR and NMR data revealed no apparent indications of polymer degradation and 90 % of the original tensile strength was maintained. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3527bee9-54bc-4a00-b1da-c6ff98f8abc8
- author
- Xia, Yifan
; Rajappan, Sinu C.
; Kraglund, Mikkel Rykær
; Serhiichuk, Dmytro
; Pan, Dong
LU
; Chen, Si
LU
; Jensen, Jens Oluf
; Jannasch, Patric
LU
and Aili, David
- organization
- publishing date
- 2025
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Power Sources
- volume
- 656
- article number
- 238047
- publisher
- Elsevier
- external identifiers
-
- scopus:105012408335
- ISSN
- 0378-7753
- DOI
- 10.1016/j.jpowsour.2025.238047
- language
- English
- LU publication?
- yes
- id
- 3527bee9-54bc-4a00-b1da-c6ff98f8abc8
- date added to LUP
- 2023-10-05 20:30:57
- date last changed
- 2025-09-10 04:05:58
@article{3527bee9-54bc-4a00-b1da-c6ff98f8abc8,
abstract = {{Poly(oxindole biphenylene) was functionalized with tetrazole pendants and evaluated as base material for alkaline ion-solvating membranes for water electrolysis. The poly(oxindole biphenylene) parent polymer was obtained by superacid catalyzed polyhydroxyalkylation and subsequently functionalized by cyanoalkylation. The cyanoalkyl groups were thereafter converted to tetrazole pendants by a click type [3 + 2] cycloaddition with sodium azide. The ion conductivity in 30 wt% KOH varied with the degree of functionalization, and reached 11 mS cm−1 at room temperature for the fully functionalized membrane. In water electrolysis tests, it supported current densities up to 800 mA cm−2 with uncatalyzed Ni-foam electrodes at a cell voltage of around 2.6 V. After 330 h of electrolysis operation at 80 °C in 30 wt% KOH, and 500 h cell test in total, FTIR and NMR data revealed no apparent indications of polymer degradation and 90 % of the original tensile strength was maintained.}},
author = {{Xia, Yifan and Rajappan, Sinu C. and Kraglund, Mikkel Rykær and Serhiichuk, Dmytro and Pan, Dong and Chen, Si and Jensen, Jens Oluf and Jannasch, Patric and Aili, David}},
issn = {{0378-7753}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Journal of Power Sources}},
title = {{Tetrazole-functionalized poly(oxindole biphenylene) ion-solvating membranes for alkaline water electrolysis}},
url = {{http://dx.doi.org/10.1016/j.jpowsour.2025.238047}},
doi = {{10.1016/j.jpowsour.2025.238047}},
volume = {{656}},
year = {{2025}},
}