Highly stable hydroxyl anion conducting membranes poly(vinyl alcohol)/poly(acrylamide-co-diallyldimethylammonium chloride) (PVA/PAADDA) for alkaline fuel cells: Effect of cross-linking

Jinli Qiao, Jing Fu, Lingling Liu, Yuyu Liu, Jiawei Sheng

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Highly stable hydroxyl anion conducting membranes have been developed using poly(vinyl alcohol) (PVA) as matrix by incorporation of poly(acrylamide-co- diallyldimethylammonium chloride) (PAADDA) as anion charge carriers. In order to clarifying the cross-linking effect on membrane performances, two series of PVA/PAADDA membranes were prepared by direct and indirect chemical cross-linking ways, and have been characterized in detail at structural and hydroxyl ion (OH-) conducting property by FTIR spectroscopy, thermal gravity analysis (TG), scanning electron microscopy (SEM), water sorption, ion exchange capacity and alkaline resistance stability. The OH- conductivity of the membranes increased with increasing the content of PAADDA in polymer and temperature, and reached 0.74-12 mS cm-1 with direct cross-linking way and 0.66-7.1 mS cm-1 with indirect cross-linking way in the temperature range 30-90°C. The membranes are found to have the same IEC values but the membranes with direct cross-linking way showed higher water uptake than that with indirect cross-link one. Both membranes showed the thermal stability above 200°C, and can integrity in 100°C hot water and methanol solution, where the swelling are better suppressed as high dense chemical cross-linkages in PVA network. Very low methanol permeability (from 1.82 × 10-7 to 3.03 × 10-7 cm2 s-1) in 50% methanol solution was obtained at 30°C. Besides, the chemical stability in 80°C, 6 M hot alkali conditions and long-term stability of 350 h in 60°C hot water revealed that the PVA/PAADDA membranes are promising for potential application in alkaline fuel cells.

Original languageEnglish
Pages (from-to)4580-4589
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number5
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Alkaline resistance stability
  • Anion-exchange membrane
  • Cross-linking effect
  • Dimensional stability
  • Hydroxide ion conductivity
  • Methanol permeability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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