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Anion exchange membranes (AEMs) with high ion conductivity and alkaline resistance are of importance for achieving high performance and long-term durability of anion exchange membrane water electrolyzers (AEMWEs) and anion exchange membrane fuel cells (AEMFCs). In the present work, we have developed a series of composite membranes composed of inorganic two-dimensional (2D) layered double hydroxide nanosheets (LDH NS), with intrinsic alkaline stability and high hydroxide ion conductivity (approaching 10−1 S cm−1), and our original partially fluorinated, quaternized polymer-based copolymers (QPAF-4) via a facile solution-casting process. The obtained organic/inorganic composite membranes (QPAF-4/LDH NS) exhibited excellent mechanical properties, characterized with a maximum elongation over 300%. A high hydroxide ion conductivity (102.0 mS cm−1) was achieved on an optimized percentage of LDH NS at 3 wt%. The hydroxyl groups on the surface of the LDH NS provided strong hydrogen bonds and highly dense Grotthuss conduction sites, which were responsible for good compatibility with the QPAF-4 matrix, contributing to high mechanical strength and high ion conductivity. Furthermore, the LDH nanosheets mitigated the chemical degradation of the ammonium groups of QPAF-4. As a result, a high retention of 80% conductivity was realized for the composite AEMs under harsh alkaline conditions (8 M KOH at 80 °C for 1000 h) compared to only 43% for the pristine QPAF-4 membranes under the same conditions. Furthermore, an alkaline water electrolysis cell was
constructed by combining the optimized QPAF-4/LDH NS composite membrane with an Ni2/3Fe1/3 LDHrGO anode catalyst, which delivered a current density of 1 A cm−2 at 1.61 V (76.4% voltage efficiency), outperforming state-of-the-art AEM electrolysis systems.

権利情報:

• In Copyright
  

キーワード: Water electrolysis, LDH nanosheet, Membrane, Anion conductivity

刊行年月日: 2025-10-13

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Journal of Materials Chemistry A (ISSN: 20507488) vol. 14 issue. 5 p. 2700-2709

研究助成金:

• Toshiaki Ogasawara Memorial Foundation
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122712807

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6131

公開URL: https://doi.org/10.1039/d5ta06131h

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更新時刻: 2026-04-30 12:01:11 +0900

MDRでの公開時刻: 2026-10-13 08:28:21 +0900