Abstract
The multicomponent membranes based on the polymer of sulfonated polyetheretherketone (SPEEK) as polyanion, the polymer of polyurethane (PU) and ionic liquid (IL) cation of 1-butyl-3-methylimidazolium (bmim+) as polycations were fabricated with layer by layer (LBL) self-assembly technique. After 100 layers deposition, the (SPEEK/PU/SPEEK/bmim)100 membranes were obtained and they showed the potential as membrane electrolytes working in proton exchange membrane fuel cell (PEMFC). Phosphoric acid (PA) molecules were doped in (SPEEK/PU/SPEEK/bmim)100 membranes anductivity of (SPEEK/PU/SPEEK/bmim)100/60%PA membranes could reach 1.03 × 10−1 S/cm at 160 °C, which was higher than the value of 6.27 × 10−2 S/cm for the comparative (SPEEK/PU)210/60%PA membranes under anhydrous conditions. Moreover, (SPEEK/PU/SPEEK/bmim)100/PA membranes exhibited the satisfactory mechanical property. The tensile stress was 2.38 MPa for (SPEEK/PU/SPEEK/bmim)100/PA membranes at room temperature. This research indicated that the properties of multicomponent LBL self-assembly membrane electrolyte could be optimized through adjusting the components.
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