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Poly(fluorenyl-indolinedione) based hydroxide conducting membrane for anion exchange membrane water electrolyzers.
- Source :
-
International Journal of Hydrogen Energy . Jan2024:Part C, Vol. 49, p1123-1133. 11p. - Publication Year :
- 2024
-
Abstract
- Anion exchange membranes (AEMs) serve as the heart of anion exchange membrane water electrolyzers (AEMWE) for green energy conversion electrochemical devices, directly determining the ultimate performance of the electrochemical devices. Conductivity in trade-off with stability (chemical and dimensional stability) is a major target in the development of alkaline membranes. We prepared chemically stable polyisatin-aromatics without ether linkages along the backbone by superacid-catalyzed alkylation. The alkali-stable dimethylpiperidinium cations were covalently linked to the polymer backbone through the aliphatic chain to give comb-type polyelectrolytes. Incorporating the fluorene structural units along the polymer skeleton is expected to improve conductivity and stability. The effect of polymer backbone structure and conformation on AEM properties is systematically elucidated. The results indicate the PipPFTI-25 AEM with 25 mol% dimethylfluorene fragments in the backbone has lower IEC (∼1.36 mmol g−1) but achieves high ionic conductivity (84.6 mS cm−1 at 80 °C). PipPFTI-25 exhibited superior dimensional and alkali stability, mainly reflected in the swelling ratio of less than 10 % while the OH− conductivity remained at 70 % after immersion in 2 M NaOH solution at 80 °C for 1680 h. The AEMWE with PipPFTI-25 operating at 60 °C in 1 M KOH achieves a current of 838 mA cm−2 at 2.5 V. This work demonstrated the feasibility of poly(fluorenyl-indolinedione) AEMs for electrolyzer applications. [Display omitted] • PFTI was synthesized by acid catalyzed Friedel-Crafts alkylation. • The effect of polymeric backbone structure on AEM properties was elucidated. • The prepared PipPFTI-25 AEM has a lower IEC but achieves high ionic conductivity. • PipPFTI AEMs have a strong potential for use in water electrolyzers. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 49
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 174104616
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2023.11.089