The proton conductive membranes were prepared by impregnating sulfonated poly(arylene ether ketone) (SP) into the porous polytetrafluoroethylene (PTFE) substrates for vanadium redox flow battery application. To impregnate SP, the surface of porous PTFE was chemically hydrophilized with catechol and polyethyleneimine (PEI). The SP filled PTFE membranes (trPTFE/SP) showed significantly enhanced thermal, dimensional, and mechanical stability, compared with the pristine SP membranes. While the water uptake of trPTFE/SP membranes reduced by only 3–5%, the swelling ratio reduced to about a half and tensile strength increased by 5 times. Although this pore filling process slightly decreased the proton conductivity of the pure SP membranes by 10%, it hugely decreased the vanadium ion permeability about 5 times. Their low vanadium permeability, 1.37 ​× ​10⁻⁷ ​cm² ​min⁻¹–4.21 ​× ​10⁻⁷ ​cm² ​min⁻¹, was even 15 times at most lower than that of Nafion117, 20.28 ​× ​10⁻⁷ ​cm² ​min⁻¹. This low vanadium permeability led to high coulombic efficiency over 96% and energy efficiency around 84% during the 100 charge-discharge cycling tests, which are better than Nafion117 membrane.

通过将磺化的聚（亚芳基醚酮）（SP）浸渍到多孔聚四氟乙烯（PTFE）基材中以制备钒氧化还原液流电池，来制备质子导电膜。为了浸渍SP，将多孔PTFE的表面用儿茶酚和聚乙烯亚胺（PEI）化学亲水化。与原始SP膜相比，填充SP的PTFE膜（trPTFE / SP）表现出显着增强的热，尺寸和机械稳定性。虽然trPTFE / SP膜的吸水率仅降低了3-5％，但溶胀率却降低了约一半，拉伸强度提高了5倍。尽管此孔填充过程将纯SP膜的质子传导率稍微降低了10％，但它使钒离子渗透率大大降低了约5倍。钒的渗透率低，为1.37×10^-7 厘米² 分钟^-1 -4.21×10 ^-7 厘米² 分钟^-1，是至多比Nafion117的下甚至15倍，20.28×10 ^-7 厘米² 分钟^{- 1}。在100次充放电循环测试中，这种低的钒渗透性导致了超过96％的高库仑效率和84％左右的能量效率，这优于Nafion117膜。