PFSA/PVDF同轴核壳纤维质子交换膜的性能研究

Properties of PFSA/PVDF coaxial core-shell fiber proton exchange membranes

构建具有核壳纤维结构的同轴电纺PFSA/PVDF质子交换膜.同轴纤维中的PFSA壳层纤维提供长程质子传输通道及高电导率,PVDF核层纤维提供强机械性能及抗溶胀性,同轴纤维限域效应将核壳层纤维中PFSA组分粘合,增强了PFSA和PVDF的界面结合.与共混浇铸膜与单轴电纺膜相比,同轴电纺膜在低溶胀条件下,表现出更高的机械强度、质子传导率和电池性能.同轴电纺膜最大拉伸强度达60.8 MPa,相较于单轴电纺膜(39.1 MPa)提高55.5%;其最大拉伸应变为180.2%,比浇铸膜提高了122.5%.80℃下,同轴电纺膜的质子传导率高达206.9 mS/cm,与Nafion 211相当,其峰值功率密度为941.7 mW/cm^(2),比浇铸膜提高80.9%,比单轴电纺膜(748.9 mW/cm^(2))提高25.7%.同轴电纺膜也显示出优异的阻气、抗氧化性能.研究表明同轴电纺质子交换膜用于燃料电池具有更好的前景.

Construction of coaxial electrospun PFSA/PVDF proton exchange membrane with core-shell fiber structure.The PFSA shell fiber in the coaxial fiber provides long-ange proton transmission channels and high electrical conductivity,the PVDF core fiber provides strong mechanical properties and anti-swelling properties,and the coaxial fiber confinement effect The PFSA component in the primary core fiber enhances the adhesion The interface of PFSA and PVDF is combined.Compared with the blended cast membrane and the uniaxial electrospun membrane,the coaxial electrospun membrane exhibited higher mechanical strength,proton conductivity and battery performance under low swelling conditions.The maximum tensile strength of the coaxial electrospun membrane is 60.8 MPa,which is 55.5%higher than that of the uniaxial electrospun membrane(39.1 MPa);its maximum tensile strain is 180.2%,which is 122.5%higher than that of the cast membrane.At 80℃,the proton conductivity of the coaxial electrospun membrane is as high as 206.9 mS/cm,which is comparable to that of Nafion 211,and its peak power density is 941.7 mW/cm^(2),which is 80.9%higher than that of the cast membrane,and higher than that of the uniaxial electrospun membrane(748.9 mW/cm^(2))increased by 25.7%.The coaxial electrospun membrane also showed excellent gas barrier and antioxidant properties.Studies have shown that coaxial electrospun proton exchange membranes have better prospects for fuel cells.