磺化聚醚砜/磷酸硼复合质子交换膜的制备与性能

采用sol-gel法成功制备了一系列有望用于高温质子交换膜燃料电池的新型磺化聚醚砜(SPES)/磷酸硼(BPO4)复合膜, 并经热重分析(TGA)-傅立叶变换红外光谱(FTIR)联用技术、差示扫描量热仪(DSC)、扫描电子显微镜(SEM)等对膜的结构和性能进行了表征. 结果表明, 复合膜较纯SPES膜具有更高的热稳定性和玻璃化转变温度, 较低的溶胀性及较高的氧化稳定性; SEM图片显示BPO4在聚合物基体中的分布十分均匀, 这将有利于连续质子传输通道的形成; 复合膜的质子传导率随BPO4含量的增加而增加, 当温度超过120 ℃后, 复合膜仍保持着较高的质子传导率, 这表明该复合膜在高温质子交换膜燃料电池中具有良好的应用前景.

Preparation and Properties of Sulfonated Poly(ether sulfone)/Boron Phosphate Composite Proton Exchange Membranes

Sulfonated poly(ether sulfone) (SPES)/boron phosphate (BPO4) composite membranes for application in high temperature proton exchange membrane fuel cells (PEMFCs) were successfully prepared by the sol-gel technique. The structure and performance of the obtained membranes were characterized by thermogravimetric analysis(TGA)-Fourier transform infrared(FTIR) spectroscopy, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). Results showed that the composite membranes had higher thermal stabilities and glass transition temperatures (Tg), less swelling and excellent oxidative stability. The morphology of the composite membranes indicated that BPO4 particles were uniformly distributed throughout the SPES matrix, which may facilitate proton transport. Proton conductivities of composite membranes increased as BPO4 content increased. SPES/BPO4 composite membranes showed good proton conductivities up to and above 120 ℃. SPES/BPO4 composite membranes are promising materials for possible use in PEMFCs, especially for high-temperature applications.