钒流电池用磺化聚芴醚酮-聚苯胺原位表面复合质子交换膜的制备

质子交换膜是液流电池的核心部件之一。文中以磺化聚芴醚酮(SPFEK)膜为基膜,采用稀溶液化学氧化聚合法在SPFEK膜表面原位复合一层聚苯胺,通过调整苯胺(An)单体的浓度,制得SPFEK/PANI复合膜。采用扫描电镜与红外光谱表征了复合膜的结构,表明聚苯胺已经成功地在SPFEK膜表面复合。通过钒流单电池的性能测试,结果表明,当苯胺单体的浓度为0.05 mol/L时,所制备的复合质子交换膜具有最高的H+传导选择性,所组装的钒流电池具有最好的自放电性能,在充放电流为50 m A/cm~2时,电池的库仑效率、电压效率、能量效率分别达到95%,83%,75%。

Preparation of Sulfonated Poly (fluorene ether ketone)/Polyaniline Composite Membranes by In-Situ Deposition for Vanadium Redox Flow Battery Application

Proton exchange membrane is a key part of vanadium redox flow battery (VRB).The sulfonated poly (fluorene ether ketone) (SPFEK)/polyaniline (PANI) composite membranes were prepared by in-situ deposition polymerization of dilute aniline on the surface of SPPEK substrate.A series of SPFEK/PANI composite membranes were fabricated by changing the concentration of aniline.The characterization restults of SEM and FT-IR show that the polyaniline has been successfully polymerized on the surface of SPFEK.After testing of properties of the composite membranes and performance of the single VRB,the result of single VRB test shows that the SPFEK/PANI-0.05 has the best selectivity of H+ and the best self-discharging.The SPFEK/PANI-0.05 has good comprehensive performance of single VRB with 95 ％ of coulombic efficiency,83 ％ of voltage efficiency and 76 ％ of energy efficiency at 50 mA/cm2.