A novel strategy for constructing a highly conductive and swelling-resistant semi-flexible aromatic polymer based anion exchange membranes |
| |
Authors: | Baolin Zhao Gaohong He Issam El Hamouti Li Gao Yanjun Liu Runlian Deng Xiaoming Yan |
| |
Affiliation: | 1. State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, LN 124221, China;2. Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian, LN 116024, China |
| |
Abstract: | A novel strategy was proposed to construct a bicontinuous hydrophilic/hydrophobic micro-phase separation structure which is crucial for high hydroxide conductivity and good dimensional stability anion exchange membranes (AEMs). A semi-flexible poly (aryl ether sulfone) containing a flexible aliphatic chain in the polymer backbone with imidazolium cationic group was synthesized by the polycondensation of bis(4-fluorophenyl) sulfone and the self-synthesized 4,4′-butane-1,4-diylbis(oxy)] diphenol followed by a two-step functionalization. The corresponding membranes were prepared by solution casting. More continuous hydroxide conducting channels were formed in the semi-flexible polymer membranes compared with the rigid based ones as demonstrated by TEM. As a result, given the same swelling ratio, hydroxide conductivity of the semi-flexible polymer membrane was about 2-fold higher than the one of the rigid polymer based membrane (e.g., 45 vs. 22 mS cm?1 with the same swelling ratio of 24% at 20 °C). The highest achieved conductivity for the semi-flexible polymer membranes at 60 °C was 93 mS cm?1, which was much higher those of other random poly (aryl ether sulfone) based imidazolium AEMs (27–81 mS cm?1). The single cell employing the semi-flexible polymer membrane exhibited a maximum power density of 125 mW cm?2 which was also higher than those for other random poly (aryl ether sulfone) based imidazolium AEMs (16–105.2 mW cm?2). |
| |
Keywords: | Semi-flexible polymer Poly (aryl ether sulfone) Anion exchange membrane Fuel cell |
本文献已被 ScienceDirect 等数据库收录! |
|