Journal
ELECTROCHIMICA ACTA
Volume 283, Issue -, Pages 691-698Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.06.197
Keywords
Polybenzimidazole; Cage-like cross-linked structure; Ionic liquid retention; High proton conductivity
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Funding
- Natural Science Foundation of China [51603017, 51673030]
- Jilin Provincial Science & Technology Department [20180101209JC, 20160520138JH, 20160519020JH]
- ChangBai Mountain Scholars Program of Jilin Province
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Polybenzimidazole/ionic liquid (IL) composite membranes with cage-like cross-linked structure were prepared based on polybenzimidazole containing hydroxyl groups (PBIOH30), 3-(triethoxysilyl) propyl isocyanate (IPTS) and 1-butyl-3-methylimidazolium dihydrogen phosphate (BMI-DHPH). The basic characteristic of imidazole rings in IL enhanced the phosphoric acid (PA) doping ability of the obtained cPBI-IL X membranes, thus, the proton conductivity of which was elevated. The cage-like cross-linked structure was formed under acidic conditions, and such structure can not only strengthen the mechanical properties of cPBI-IL X membranes but also prevent the leakage of the IL to some extent. The IL retention ability of cPBI-IL 10 was significantly improved, the residual weight percentage of IL was 71.6 wt%, while that of PBI-IL 10 membrane without cage-like cross-linked structure was only 2 wt%. The membrane with 8 wt% IL content exhibited the highest proton conductivity of 0.133 S cm(-1) at 160 degrees C. (C) 2018 Elsevier Ltd. All rights reserved.
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