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Highly stable alkaline polymer electrolyte based on a poly(ether ether ketone) backbone.

Juanjuan Han1, Hanqing Peng, Jing Pan

  • 1College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources, Wuhan University , Wuhan 430072, China.

ACS Applied Materials & Interfaces
|November 16, 2013
PubMed
Summary
This summary is machine-generated.

New alkaline polymer electrolytes based on poly(ether ether ketone) (PEEK) show remarkable stability in alkaline fuel cells. This breakthrough addresses a key challenge for developing durable and efficient alkaline polymer electrolyte fuel cells (APEFCs).

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Alkaline polymer electrolyte fuel cells (APEFCs) are attractive due to their potential for using nonprecious metal catalysts.
  • A major hurdle for APEFCs is the chemical instability of alkaline polymer electrolytes (APEs) in alkaline environments.
  • Cationic functionalization of stable polymer backbones like polysulfone (PSF) can lead to degradation.

Purpose of the Study:

  • To develop a highly stable alkaline polymer electrolyte for APEFC applications.
  • To investigate the use of poly(ether ether ketone) (PEEK) as a robust backbone for APEs.
  • To assess the chemical stability and mechanical properties of the novel PEEK-based APE.

Main Methods:

  • Poly(ether ether ketone) (PEEK) was functionalized with sulfonic acid (SA) and quaternary ammonia (QA) groups, with QA as the majority.
  • The resulting membrane (xQAPEEK) was characterized for mechanical strength and swelling.
  • Chemical stability was tested in 1 mol/L KOH at 80 °C for 30 days, comparing weight loss to a PSF-based electrolyte.

Main Results:

  • Ionic cross-linking between SA and QA groups in xQAPEEK resulted in high mechanical strength and low swelling.
  • The xQAPEEK membrane demonstrated outstanding stability, with only 6 wt % weight loss after 30 days in harsh alkaline conditions.
  • In contrast, a quaternary ammonia PSF membrane degraded significantly (over 40 wt % weight loss) under identical conditions.

Conclusions:

  • Poly(ether ether ketone) (PEEK) is a viable and highly stable backbone for alkaline polymer electrolytes.
  • The developed PEEK-based APE (xQAPEEK) exhibits superior chemical stability compared to traditional PSF-based electrolytes.
  • This research offers a promising pathway for creating durable APEs, advancing the development of practical APEFC technology.