Bi-functionalized copolymer-sulphonated SiO2 embedded with aprotic ionic liquid based anhydrous proton conducting membrane for high temperature application

Amit K. Thakur, Murli Manohar, Vinod K. Shahi

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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 0-10wt% sulphonated silica and 20wt% 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 (1.57mScm-1) was increased with incorporation of sulphonated-SiO2 (10wt%) in the membrane matrix (BFC/Si-10) (3.56mScm-1), may be due to formation of interconnected network or channels in the membrane matrix. After embedding of aprotic IL (20wt%; ~80μS/cm conductivity) in highly acidic polymer (BFC/Si-10), conductivity of BFC/Si-10/IL composite PEM was about 8.79mScm-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.

Original languageEnglish
Pages (from-to)266-274
Number of pages9
JournalJournal of Membrane Science
Volume490
DOIs
StatePublished - 5 Sep 2015
Externally publishedYes

Keywords

  • Anhydrous
  • Aprotic ionic liquid
  • High-temperature conductivity
  • Proton conducting membrane
  • Sulphonated silica

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science (all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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