| 초록 |
The organic-inorganic hybrid composite membrane of sulfonated poly (phenylene oxide) (sPPO)-nano sized sulfonated silica (sSiO2) was prepared to improve the ionic conductivity (IC) and decrease vanadium permeability for vanadium redox flow battery (VRFB). Comparatively, the sPPO with 2% sSiO2 showed higher WU, IC and IEC than sPPO alone. The IC of hybrid membranes are 0.050, 0.073, 0.077 and 0.073 S/cm for sPPO, sPPO-1, 2 and 4% sSiO2 membranes, respectively. The hybrid membranes has exhibited higher IC because of hydrophilic properties of SiO2-SO3H in sPPO polymer matrix. The VO2+ permeability of Nafion®212, sPPO and sPPO- 2% sSiO2 hybrid membranes are 2.22 × 10−7, 2.50 × 10−8 and 4.76 × 10−9 cm2 min−1, respectively. The inorganic nanofillers of sSiO2 in sPPO membrane appeared to act as a barrier to VO2+ ions crossover. Low cost, high IC and lower vanadium permeability of sPPO-sSiO2 hybrid membrane can be considered as a promising ion exchange membrane for advanced VRFB system |
