Nafion®/nitrated sulfonated poly(ether ether ketone) membranes for direct methanol fuel cells

Jie Cheng Tsai, Jen Feng Kuo, Chuh-Yung Chen

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Sulfonated poly(ether ether ketone)s (SPEEKs) are substituted on the main chain of the polymer by nitro groups and blended with Nafion® to attain composite membranes. The sulfonation, nitration and blending are achieved with a simple, inexpensive process, and the blended membranes containing the nitrated SPEEKs reveal a liquid-liquid phase separation. The blended membranes have a lower water uptake compared to recast Nafion®, and the methanol permeability is reduced significantly to 4.29 × 10-7-5.34 × 10-7 cm2 s-1 for various contents of nitrated SPEEK for S63N17, and 4.72 × 10-7-7.11 × 10-7 cm2 s-1 for S63N38, with a maximum proton conductivity of ∼0.085 S cm-1. This study examines the single-cell performance at 80 °C of Nafion®/nitrated SPEEK membranes with various contents of nitrated SPEEK and a degree of nitration of 23-25 mW cm-2 for S63N17 and 24-29 mW cm-2 for S63N38. Both the power density and open circuit voltage are higher than those of Nafion® 115 and recast Nafion®.

Original languageEnglish
Pages (from-to)226-233
Number of pages8
JournalJournal of Power Sources
Issue number1
Publication statusPublished - 2009 Oct 20

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


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