Vijayakumar, Vijayalekshmi Son, Tae Yang Im, Kwang Seop Chae, Ji Eon Kim, Hyoung Juhn Kim, Tae Hyun Nam, Sang Yong 2024-01-19T15:02:15Z 2024-01-19T15:02:15Z 2022-01-25 2021-04 2470-1343 https://pubs.kist.re.kr/handle/201004/117164 Anion exchange membranes (AEMs) with good alkaline stability and ion conductivity are fabricated by incorporating quaternary ammonium-modified silica into quaternary ammonium-functionalized poly(2,6-dimethyl-1,4-phenylene oxide) (QPPO). Quaternary ammonium with a long alkyl chain is chemically grafted to the silica in situ during synthesis. Glycidyltrimethylammoniumchloride functionalization on silica (QSiO(2)) is characterized by Fourier transform infrared and transmission electron microscopic techniques. The QPPO/QSiO(2) membrane having an ion exchange capacity of 3.21 meq.g(-1) exhibits the maximum hydration number (lambda = 11.15) and highest hydroxide ion conductivity of 45.08 x 10(-2) S cm(-1) at 80 degrees C. In addition to the high ion conductivity, AEMs also exhibit good alkaline stability, and the conductivity retention of the QPPO/QSiO(2)-3 membrane after 1200 h of exposure in 1 M potassium hydroxide at room temperature is about 91% ascribed to the steric hindrance offered by the grafted long glycidyl trimethylammonium chain in QSiO(2). The application of the QPPO/QSiO(2)-3 membrane to an alkaline fuel cell can yield a peak power density of 142 mW cm(-2) at a current density of 323 mA cm(-2) and 0.44 V, which is higher than those of commercially available FAA-3-50 Fumatech AEM (OCV: 0.91 V; maximum power density: 114 mW cm(-2) at current density: 266 mA cm(-2) and 0.43 V). These membranes provide valuable insights on future directions for advanced AEM development for fuel cells. English AMER CHEMICAL SOC Anion Exchange Composite Membranes Composed of Quaternary Ammonium-Functionalized Poly(2,6-dimethyl-1,4-phenylene oxide) and Silica for Fuel Cell Application Article 10.1021/acsomega.1c00247 1 ACS OMEGA, v.6, no.15, pp.10168 - 10179 ACS OMEGA 6 15 10168 10179 N scie scopus 000643537100020 2-s2.0-85105117379 Chemistry, Multidisciplinary Chemistry Article POLYHEDRAL OLIGOMERIC SILSESQUIOXANE POLYMER ELECTROLYTE MEMBRANE LAYERED DOUBLE HYDROXIDE TITANATE NANOTUBES HYBRID MEMBRANES POLYSULFONE PERFORMANCE CONDUCTIVITY NETWORK