Improving proton conductivity of sulfonated poly (ether ether ketone) proton exchange membranes at low humidity by semi-interpenetrating polymer networks preparation

Xuemei Wu, Gaohong He, Xiangcun Li, Fei Nie, Xiaoming Yan, Lu Yu, Jay Benziger

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Crosslinked poly (styrene sulfonic acid) (CrPSSA) is incorporated into sulfonated poly (ether ether ketone) (SPEEK) through the semi-interpenetrating polymer networks (sIPNs) method to improve proton conductivity of SPEEK proton exchange membranes (PEMs) at low relative humidity (RH). Thermogravimetric analysis indicates that the SPEEK/CrPSSA sIPN membrane can be stable up to 250 C in N2. A single glass transition temperature (Tg) of the sIPN measured by differential scanning calorimetric measurements suggests good miscibility of the CrPSSA and SPEEK. At fixed RH the proton conductivity of the sIPN membranes increases as more CrPSSA is incorporated into SPEEK membranes. The sIPN membrane with 40 wt. % CrPSSA has a proton conductivity of 10 -3 S cm-1 at 25% RH, which comparable to that of Nafion115 and is 2 orders of magnitude higher than that of the pristine SPEEK membranes (10-5 S cm-1 at RH 50%). The percolation threshold for proton conduction occurs at lower hydrophilic volume fractions with the increasing content of CrPSSA, suggesting different packing behavior of -SO 3H groups in the SPEEK/CrPSSA sIPN membranes as compared with SPEEK and Nafion® membranes.

Original languageEnglish (US)
Pages (from-to)482-490
Number of pages9
JournalJournal of Power Sources
Volume246
DOIs
StatePublished - Jan 1 2014

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Fuel cells
  • Interpenetrating polymer networks
  • Ionomers
  • Poly (ether ether ketone)
  • Proton exchange membranes

Fingerprint Dive into the research topics of 'Improving proton conductivity of sulfonated poly (ether ether ketone) proton exchange membranes at low humidity by semi-interpenetrating polymer networks preparation'. Together they form a unique fingerprint.

  • Cite this