Transport properties of MF-4SС membranes doped by sulfonated zirconia
Composite materials based on homogeneous perfluorinated cation exchange membranes MF-4SK and sulfonated zirconium oxide were obtained by in situ and casting methods and their transport properties and gas permeability were studied. With the introduction of sulfonated zirconia, the conductivity of in situ and casting membranes increases at room temperature by more than 1.5 and 4 times, respectively. The anion transfer numbers characterizing the undesirable anion transfer for composite membranes obtained by the in situ and casting methods decrease by more than 1.5 times (from 0.026 to 0.020 and from 0.020 to 0.014, respectively). For samples based on MF-4SK membranes and zirconium oxide, a significant (more than 3 times) decrease in hydrogen permeability was noted. The differences in the observed values of moisture content, conductivity and mutual diffusion of the obtained composite membranes are discussed.