A proton conductive silicate-nanoencapsulated polyimide nonwoven as a novel porous substrate for a reinforced sulfonated poly(arylene ether sulfone) composite membrane

Jong Heon Seol, Ji Hye Won, Moo Seok Lee, Kyung Suk Yoon, Young Taik Hong, Sang Young Lee

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

A novel reinforcing porous substrate that features unprecedented capability of offering proton conductivity is demonstrated for potential use in a reinforced composite proton exchange membrane. The unusual porous substrate (hereinafter, referred to as "sPI substrate") is composed of 3-trihydroxysilyl propane-1-sulfonic acid (THSPSA)-based silicate coating layers and electrospun polyimide (PI) nonwoven fibers. The THSPSA coating layers bearing sulfonic acid groups endow the sPI substrate with strong affinity for water molecules and also afford appreciable proton conductivity. Another distinctive characteristic of the sPI substrate is the nanoarchitectured structure of the THSPSA coating layers (shell) that encapsulate the PI nonwoven fibers (core). As a result, the core-shell structured sPI substrate maintains a highly porous structure, which plays a crucial role in providing effective proton-conducting channels after the impregnation of a polymer electrolyte (herein, sulfonated poly(arylene ether sulfone) (SPAES)). Notably, owing to the assistance of the proton-conductive sPI substrate, the sPI substrate-reinforced SPAES composite membrane presents higher proton conductivity than a PI nonwoven-reinforced SPAES composite membrane under various relative humidity (RH) conditions. This intriguing proton conductivity behavior is discussed based on an in-depth understanding of the unique core-shell structure and functionality of the sPI substrate and, moreover, is quantitatively interpreted by estimating theoretical proton conductivities predicted from series and parallel two-layer models.

Original languageEnglish
Pages (from-to)1634-1642
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number4
DOIs
Publication statusPublished - 2012 Jan 28

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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