Poly(Ethylene Piperidinium)s for Anion Exchange Membranes

The lack of anion exchange membranes (AEMs) that possess both high hydroxide conductivity and stable mechanical and chemical properties poses a major challenge to the development of high-performance fuel cells. Improving one side of the balance between conductivity and stability usually means sacrif...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-09, Vol.62 (38), p.e202307690-e202307690
Main Authors: Chen, Huanhuan, Bang, Ki-Taek, Tian, Ye, Hu, Chuan, Tao, Ran, Yuan, Yufei, Wang, Rui, Shin, Dong-Myeong, Shao, Minhua, Lee, Young Moo, Kim, Yoonseob
Format: Article
Language:English
Subjects:
Anion exchange
Anion exchanging
Chemical properties
Chemical reactions
Chemical synthesis
Conductivity
Crosslinking
Fuel cells
Fuel technology
Membranes
Performance enhancement
Polymers
Stability
Swelling
Water uptake
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Summary:The lack of anion exchange membranes (AEMs) that possess both high hydroxide conductivity and stable mechanical and chemical properties poses a major challenge to the development of high-performance fuel cells. Improving one side of the balance between conductivity and stability usually means sacrificing the other. Herein, we used facile, high-yield chemical reactions to design and synthesize a piperidinium polymer with a polyethylene backbone for AEM fuel cell applications. To improve the performance, we introduced ionic crosslinking into high-cationic-ratio AEMs to suppress high water uptake and swelling while further improving the hydroxide conductivity. Remarkably, PEP80-20PS achieved a hydroxide conductivity of 354.3 mS cm at 80 °C while remaining mechanically stable. Compared with the base polymer PEP80, the water uptake of PEP80-20PS decreased by 69 % from 813 % to 350 %, and the swelling decreased substantially by 85 % from 350.0 % to 50.2 % at 80 °C. PEP80-20PS also showed excellent alkaline stability, 84.7 % remained after 35 days of treatment with an aqueous KOH solution. The chemical design in this study represents a significant advancement toward the development of simultaneously highly stable and conductive AEMs for fuel cell applications.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202307690