Synthesis of Sulfonated Polystyrene/acrylate–ionic Liquid (Si-SPS/A–IL) Hybrid Membranes for Methanol Fuel Cells


Department of chemistry, Azarbaijan Shahid Madani University, Tabriz, Iran


In this paper, the silicon-containing sulfonated polystyrene/acrylate–ionic liquid (Si-SPS/A–IL)
hybrid membranes was prepared to obtain the proton exchange membrane (PEM) materials with
high methanol barrier and good selectivity. The Si-SPS/A–IL hybrid membranes characterized as
the function of IL to evaluate their potential as PEMs in direct methanol fuel cells (DMFCs).Four
different Hybrid material with different properties have been synthesized and named from I to
IV.The potential of the membranes in direct methanol fuel cells (DMFCs) is characterized
preliminarily by studying their thermal stability, ion-exchange capacity, water uptake, methanol
diffusion coefficient, proton conductivity and selectivity (proton conductivity/methanol diffusion
coefficient). All the hybrid membranes exhibit good thermal stability and reasonable water uptake.
IV and V membranes have a low methanol diffusion coefficient, while II and III membrane have
good proton conductivity. In addition, the selectivity values of hybrid membranes increase with
increasing IL content and V membrane shows the best selectivity (1.14×105Ss cm−3). These results
suggest that the Si-SPS/A–IL hybrid membranes are possible candidate materials for PEMs in
DMFC applications.