Lim, Haeryang Lee, Boryeon Yun, Dayoung Al Munsur, Abu Zafar Chae, Ji Eon Lee, So Young Kim, Hyoung-Juhn Nam, Sang Yong Park, Chi Hoon Kim, Tae-Hyun 2024-01-19T21:04:31Z 2024-01-19T21:04:31Z 2022-01-25 2018-12 1944-8244 https://pubs.kist.re.kr/handle/201004/120595 Poly(2,6-dimethyl-1,4-phenylene oxide)s (PPOs)-based anion exchange membranes (AEMs) with four of the most widely investigated head groups were prepared. Through a combination of experimental and simulation approaches, the effects of the different types of head groups on the properties of the AEMs, including hydroxide conductivity, water content, physicochemical stability, and fuel cell device performance were fully explored. Unlike other studies, in which the conductivity was mostly investigated in liquid water, the conductivity of the PPO-based AEMs in 95% relative humidity (RH) conditions as well as in liquid water was investigated. The conductivity trend in 95% RH condition was different from that in liquid water but corresponded well with the actual cell performance trend observed, suggesting that the AEM fuel cell performance under in situ cell conditions (95% RH, 60 degrees C, H-2/O-2) is more closely related to the conductivity measured ex situ under 95% RH conditions (60 degrees C) than in liquid water. On the basis of the conductivity data and molecular simulation results, it was concluded that the predominant hydroxide ion-conducting mechanism in liquid water differs from that in the operating fuel cell environment, where the ionomers become hydrated only as a result of water vapor transported into the cells. English American Chemical Society Poly(2,6-dirnethyl-1,4-phenylene oxide)s with Various Head Groups: Effect of Head Groups on the Properties of Anion Exchange Membranes Article 10.1021/acsami.8b13016 1 ACS Applied Materials & Interfaces, v.10, no.48, pp.41279 - 41292 ACS Applied Materials & Interfaces 10 48 41279 41292 N scie scopus 000452694100035 2-s2.0-85057051739 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article POLY(ARYLENE ETHER SULFONE)S ALKALINE STABILITY FUEL-CELLS MOLECULAR-DYNAMICS FUNCTIONAL-GROUP HYDROXIDE PERFORMANCE TRANSPORT POLYMER CATIONS anion exchange membranes head groups Conducting mechanism room humidity condition molecular simulation