Sung, Seounghwa Chae, Ji Eon Min, Kyungwhan Kim, Hyoung-Juhn Nam, Sang Yong Kim, Tae-Hyun 2024-01-19T15:33:10Z 2024-01-19T15:33:10Z 2021-09-02 2021-01-14 2050-7488 https://pubs.kist.re.kr/handle/201004/117530 The process of crosslinking is widely employed to increase the physicochemical stability of anion exchange membranes and, in some cases, improve ion conductivity. For a general case in which a polymer is crosslinked by a crosslinking agent, the physicochemical properties of the polymer can be greatly altered, depending on the type of crosslinking agent. In this study, we induced crosslinking without a crosslinking agent to intentionally maximise various physical properties (i.e., mechanical properties, swelling ratios, and so forth) of two commercially-available polymers. A triazole was incorporated into the conducting group to maximise the ion conductivity, especially under room humidity (RH) conditions. The crosslinked PPO-SEBS membranes prepared through this approach were not only capable of forming very thin membranes (10 mu m thickness) with excellent physical properties (34.3 MPa of tensile strength and 91.6% of elongation at break) but also exhibited high hydroxide ion conductivity under 95% RH, and conductivity plays an important role in achieving good fuel cell performance. When the membrane electrode assembly (MEA), as fabricated utilising a crosslinked PPO-SEBS membrane and a platinum on carbon (Pt/C) catalyst on each electrode, was operated in conditions with a H-2/O-2 gas flow and a 60 degrees C temperature, a stable fuel cell performance was obtained for a long period of time (300 hours) at a maximum power density of 405 mW cm(-2). This result surpasses the performance of commercialized AEMs and is comparable with the performance levels of cutting-edge AEMs when operated under similar conditions. English ROYAL SOC CHEMISTRY ALKALINE FUEL-CELLS QUATERNARY AMMONIUM CATIONS WATER MANAGEMENT LOW HUMIDITY MECHANICAL-PROPERTIES ELECTRODE ASSEMBLIES HIGH-TEMPERATURE PERFORMANCE STABILITY DEGRADATION Preparation of crosslinker-free anion exchange membranes with excellent physicochemical and electrochemical properties based on crosslinked PPO-SEBS Article 10.1039/d0ta10194j 1 JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.2, pp.1062 - 1079 JOURNAL OF MATERIALS CHEMISTRY A 9 2 1062 1079 scie scopus 000609149500029 2-s2.0-85099592548 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article ALKALINE FUEL-CELLS QUATERNARY AMMONIUM CATIONS WATER MANAGEMENT LOW HUMIDITY MECHANICAL-PROPERTIES ELECTRODE ASSEMBLIES HIGH-TEMPERATURE PERFORMANCE STABILITY DEGRADATION