Cross-linked poly(vinyl alcohol)/poly (diallyldimethylammonium chloride) as anion-exchange membrane for fuel cell applications

Jing Zhang, Jinli Qiao, Gaopeng Jiang, Lingling Liu, Yuyu Liu

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

The novel, low-cost anion-exchange membranes (abbreviated as PVA/PDDA-OH-), made from poly(vinyl alcohol) and poly(diallyldimethylammonium chloride) blends, are successfully synthesized by a combined thermal and chemical cross-linking technique. The hydroxide (OH -) conductivity, water uptake, ion exchange capacity (IEC), thermal stability, oxidative stability and alkaline stability of PVA/PDDA-OH- membranes are measured to evaluate their applicability in alkaline fuel cells. The effects of cross-linking procedure, cross-linking time and membrane composition on OH- conductivity are studied using AC impedance technique. It is found that by cross-linking modifications, the membranes exhibit excellent thermal stability with onset degradation temperature high above 170 C, a relatively high oxidative stability at 60 C, and a strong alkaline stability in 8 M KOH at 80 C. High OH- conductivity of 0.025 S cm-1 is achieved at 25 C and reaches up to 0.037 S cm-1 at 80 C. For exploring the conducting mechanisms, the concentration and mobility of charge carries of the membranes are also measured. The H 2/O2 fuel cell tests with PVA/PDDA-OH- membranes yield the peak power density of 11.5 mW cm-2 and greatly increase to 35.1 mW cm-2 depending on PVA/PDDA mass ratio, on a low metal loading on both the anode and the cathode of 0.5 mg (Pt) cm-2 at ambient temperature.

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalJournal of Power Sources
Volume240
DOIs
Publication statusPublished - 2013

Keywords

  • Alkaline anion-exchange membrane
  • Cross-linking
  • Hydroxide conductivity
  • Membrane electrode assembly
  • Stability

ASJC Scopus subject areas

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

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