Polyimide nonwoven fabric-reinforced, flexible phosphosilicate glass composite membranes for high-temperature/low-humidity proton exchange membrane fuel cells

Jun Muk Lim, Ji Hye Won, Hyeon Ji Lee, Young Taik Hong, Moo Seok Lee, Chang Hyun Ko, Sang Young Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We demonstrate polyimide (PI) nonwoven fabric-reinforced, flexible proton-conductive phosphosilicate glass composite membranes for potential application in high-temperature/low-humidity proton exchange membrane fuel cells (PEMFCs). The new reinforced composite membrane is fabricated via the impregnation of a 3-glycidyloxypropyl trimethoxysilane (GPTMS)/orthophosphoric acid (H 3PO 4) mixture into a PI nonwoven substrate followed by in situ sol-gel synthesis and hydrothermal treatment. This unique structural integrity enables the reinforced composite membrane to provide unprecedented improvement in the mechanical properties (notably flexibility and thickness) over typical bulk phosphosilicate glasses that are highly fragile and thick. Meanwhile, the highly porous structure of the PI reinforcing framework allows for the facile formation of a three-dimensionally interconnected phosphosilicate glass matrix in the reinforced composite membrane, which in turn offers favorable pathways for proton transport. Another advantageous feature of the reinforced composite membrane is higher proton conductivity under dehumidified conditions, as compared to a hydration-dependent polymer electrolyte membrane such as sulfonated poly(arylene ether sulfone) (SPAES). This superior proton conductivity of the reinforced composite membrane is further discussed with in-depth consideration of its architectural novelty and proton transport phenomena governed by the Grotthuss mechanism.

Original languageEnglish
Pages (from-to)18550-18557
Number of pages8
JournalJournal of Materials Chemistry
Volume22
Issue number35
DOIs
Publication statusPublished - 2012 Sep 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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