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Media type:
E-Article
Title:
Performance of quaternized polybenzimidazole-cross-linked poly(vinylbenzyl chloride) membranes in HT-PEMFCs
Contributor:
Arslan, Funda
[Author];
Kerres, Jochen
[Author];
Freiberg, Anna
[Author];
Cherevko, Serhiy
[Author];
Kormanyos, Attila
[Author];
Sit, Ferit
[Author];
Böhm, Thomas
[Author];
Chuluunbandi, Khajidkhand
[Author];
Thiele, Simon
[Author]
Published:
Soc., 2021
Published in:ACS applied materials & interfaces 13(47), 56584–56596 (2021). doi:10.1021/acsami.1c17154
Language:
English
DOI:
https://doi.org/10.1021/acsami.1c17154
ISSN:
1944-8244
Origination:
Footnote:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Description:
High-temperature proton-exchange membrane fuel cells (HT-PEMFCs) are mostly based on acid-doped membranes composed of polybenzimidazole (PBI). A severe drawback of acid-doped membranes is the deterioration of mechanical properties upon increasing acid-doping levels. Cross-linking of different polymers is a way to mitigate stability issues. In this study, a new ion-pair-coordinated membrane (IPM) system with quaternary ammonium groups for the application in HT-PEMFCs is introduced. PBI cross-linked with poly(vinylbenzyl chloride) and quaternized with three amines (DABCO, quinuclidine, and quinuclidinol) are manufactured and compared to the state-of-the-art commercial Dapazol PBI membrane ex situ as well as by evaluating their HT-PEMFC performance. The IPMs show reduced swelling and better mechanical properties upon doping, which enables a reduction in membrane thickness while maintaining a comparably low gas crossover and mechanical stability. The HT-PEMFC based on the best-performing IPM reaches up to 530 mW cm–2 at 180 °C under H2/air conditions at ambient pressure, while Dapazol is limited to less than 430 mW cm–2 at equal parameters. This new IPM system requires less acid doping than conventional PBI membranes while outperforming conventional PBI membranes, which renders these new membranes promising candidates for application in HT-PEMFCs.