期刊
JOURNAL OF MEMBRANE SCIENCE
卷 619, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2020.118774
关键词
Anion exchange membranes; poly(phenylene oxide); Crosslinking; Ethylene oxide crosslinker; Hydrophilicity
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2015M1A2A2058013]
- Incheon National University Research Grant in 2019
- National Research Foundation of Korea [2015M1A2A2058013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study investigated novel anion exchange membranes prepared using crosslinkers containing ethylene oxide, finding that the length of the ethylene oxide chain affected the conductivity and stability of the membranes. The membrane utilizing bis(ethylene oxide) as a crosslinker showed the highest conductivity and performance characteristics.
Crosslinked poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) using hydrophilic crosslinkers that contain ethylene oxide (EO) were prepared as novel anion exchange membranes (AEMs), and the effect of crosslinker EO length was systematically investigated. The physicochemical, morphological and electrochemical properties of the corresponding AEMs were also compared against the membrane prepared from a typical hydrophobic alkyl-type crosslinker. The ethylene oxide crosslinker helped to form ion clusters and to enhance the water-holding capacity of the corresponding AEMs, which promoted high conductivity both in water and in 95% room humidity conditions, whilst maintaining high physicochemical stability. However, it was also found that the presence of a long ethylene oxide as a crosslinker may induce polymer crystallinity, which reduces both conductivity and the alkaline stability of the corresponding crosslinked membranes. The effect of ethylene oxide chain length on the morphology, electrochemical and physicochemical properties, were also investigated. The xBEO-PPO membrane, having bis(ethylene oxide) (BEO) as a crosslinker, showed the highest conductivity of 131.96 mS/cm in water at 80 degrees C, and 55.21 mS/cm in 95% RH at 80 degrees C; this was owing to its crystalline nature. The single-cell performance of 444 mW/cm(2) peak power density, was also obtained from the xBEO-PPO membrane.
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