Preparation of poly(vinylidene fluoride) nanocomposite membranes based on graft polymerization and sol-gel process for polymer electrolyte membrane fuel cells

Won Seok Chi, Rajkumar Patel, Hyungkwon Hwang, Yong Gun Shul, Jong Hak Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Proton conducting nanocomposite membranes consisting of poly(vinylidene fluoride-co-chlorotrifluoroethy-lene)-graft-poly(styrene sulfonic acid), i.e., P(VDF-co-CTFE)-g-PSSA graft copolymer and sulfonated silica and were prepared using a sol-gel reaction and subsequent oxidation of a silica precursor, i.e., (3-mercaptopropyl) trimethoxysilane (MPTMS). The successful formation of amorphous phase nanocomposite membranes was confirmed via FT-IR and wide-angle X-ray scattering. All membranes were semi-transparent and mechanically strong, as characterized by a universal tensile machine. Transmission electron microscopy and small-angle X-ray scattering analysis revealed that silica 5-10 nm in size were homogeneously dispersed in the matrix at up to 5 wt.% of MPTMS. At higher concentrations, the silica grew to more than 50 nm in size, which disrupted the microphase-separated structure of the graft copolymer. As a result, both proton conductivity (0.12 S/cm at 25 °C) and single cell performance (1.0 W/cm 2 at 75 °C) were maximal at 5 wt.% MPTMS.

Original languageEnglish
Pages (from-to)1405-1414
Number of pages10
JournalJournal of Solid State Electrochemistry
Volume16
Issue number4
DOIs
Publication statusPublished - 2012 Apr 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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