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Bi-functionalized copolymer-sulphonated SiO2 embedded with aprotic ionic liquid based anhydrous proton conducting membrane for high temperature application.
- Source :
-
Journal of Membrane Science . Sep2015, Vol. 490, p266-274. 9p. - Publication Year :
- 2015
-
Abstract
- We prepared highly charged bi-functionalized copolymer (BFC) and sulphonated mesoporous silica embedded with aprotic ionic liquid (IL) (1-ethyl-3-methylimidazolium ethyl sulfate) based anhydrous conducting cross-linked polymer electrolyte membrane (PEM) by sol–gel. Composite PEMs with 0–10 wt% sulphonated silica and 20 wt% IL content (BFC/Si- x /IL) were characterized by their morphology, stability, IEC, water retention ability and temperature dependent anhydrous conductivity. Conductivity of pristine BFC membrane (1.57 mS cm −1 ) was increased with incorporation of sulphonated-SiO 2 (10 wt%) in the membrane matrix (BFC/Si-10) (3.56 mS cm −1 ), may be due to formation of interconnected network or channels in the membrane matrix. After embedding of aprotic IL (20 wt%; ~80 µS/cm conductivity) in highly acidic polymer (BFC/Si-10), conductivity of BFC/Si-10/IL composite PEM was about 8.79 mS cm −1 at 30 °C. High anhydrous conductivity for BFC/Si-10/IL PEM was attributed to the exchanged protons from highly acidic membrane matrix by IL cation, and accordingly a mechanism was proposed. Further, enhanced bound water content and thus slow dehydration of BFC/Si- x /IL composite PEMs, make them a promising candidate for fuel cell application under low humidification. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03767388
- Volume :
- 490
- Database :
- Academic Search Index
- Journal :
- Journal of Membrane Science
- Publication Type :
- Academic Journal
- Accession number :
- 103117132
- Full Text :
- https://doi.org/10.1016/j.memsci.2015.04.061