Influence of Silica Content in Crosslinked PVA/PSSA_MA/Silica Hybrid Membrane for Direct Methanol Fuel Cell (DMFC)

  • Kim, Dae-Sik (Institute for Chemical Process and Environmental Technology, National Research Council) ;
  • Guiver, Michael D. (Institute for Chemical Process and Environmental Technology, National Research Council) ;
  • Seo, Mu-Young (Department of Chemical Engineering, Hannam University, Daeduk Valley Campus) ;
  • Cho, Hyun-Il (Department of Chemical Engineering, Hannam University, Daeduk Valley Campus) ;
  • Kim, Dae-Hoon (Department of Chemical Engineering, Hannam University, Daeduk Valley Campus) ;
  • Rhim, Ji-Won (Department of Chemical Engineering, Hannam University, Daeduk Valley Campus) ;
  • Moon, Go-Young (CRD, Research Park, LG Chem.) ;
  • Nam, Sang-Yong (Department of Polymer Science and Engineering, Engineering Research Institute, i-Cube Center, Gyeongsang National University)
  • Published : 2007.08.31

Abstract

In the present study, crosslinked poly(vinyl alcohol) (PVA) membranes were prepared at different temperatures using poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) (PVA:PSSA_MA = 1:9). The hybrid mem-branes were prepared by varying the TEOS content between 5 and 30 wt%. The PSSA_MA was used both as a crosslinking agent and the hydrophilic group donor ($-SO_3H$ and/or-COOH). The proton conductivity increased with up to 20 wt% TEOS, but decreased above this level, although the water content decreased with increasing TEOS content. This result suggests that the silica doped into the membrane improved the formation of proton-conduction pathways due to the absorption of molecular water. The PVA/PSSA_MA/Silica containing TEOS 20% showed both high proton conductivity (0.026 S/cm at $90^{\circ}C$) and low methanol permeability ($5.55{\times}10^{-7}cm^2/s$).

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