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

摘要

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 membranes 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(-SO3H 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°C)and low methanol permeability(5.55X10~(-7)cm2/s).