Jung, Jiyoon Park, Young Sang Koo, Mo Beom Ku, Jinsuk Ahn, Cheol-Hee Hwang, Seung Sang Chung, Hoon Taek Lee, Albert S. 2026-01-13T06:30:08Z 2026-01-13T06:30:08Z 2026-01-12 2026-01 1613-6810 https://pubs.kist.re.kr/handle/201004/153977 The intrinsic trade-off between ion conductivity and mechanical integrity in high-ion exchange capacity (IEC) anion exchange membranes (AEMs) has remained a major challenge for the practical implementation of anion exchange membrane water electrolyzer (AEMWE) technology. Here, crosslinked AEMs (BP-cross-PDAA) is developed via free-radical cyclopolymerization of diallylammonium-functionalized poly(biphenyl alkylene), where the IEC (n) is precisely tuned from 2.32 meq g−1 to 3.39 meq g−1 by adjusting the content of diallyldimethylammonium comonomer. BP-cross-PDAA membranes exhibited excellent hydration characteristics, including hydroxide conductivity (up to 152.4 mS cm−1 at 80 °C), swelling ratio (24.2%), and alkaline stability (98.7% retention over 350 h), attributed to their robust crosslinked network structure without sacrificing their high IEC. Furthermore, membrane-electrode assembly (MEA-n) tests demonstrated remarkable AEMWE performance, with MEA-3.39 achieving a peak current density of 12.39 A cm−2 at 2.0 V using a non-platinum group metal anode, and 6.1 A cm−2 under pure water condition. MEA-3.39 also exhibited excellent durability, with a minimal voltage degradation rate of 1.2 µV h−1 over 1,000 h at 1 A cm−2 in 1 M KOH at 50 °C. English Wiley - V C H Verlag GmbbH & Co. In Situ Crosslinked Diallylammonium-Functionalized Poly(Biphenyl Alkylene) for High-Performance Anion Exchange Membranes Article 10.1002/smll.202511358 1 Small, v.22, no.5 Small 22 5 N scie 001640739300001 2-s2.0-105025059145 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article POLYMER LINKING anion exchange membrane water electrolyzer crosslinked anion exchange membrane free-radical cyclopolymerization