Polybenzimidazole (PBI)-sulfonated nano titania (S-TiO₂) polymer composite membranes have been prepared by solvent casting technique for high temperature polymer electrolyte membrane (HT-PEM) fuel cells. X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy was used to characterize the polymer structure and confirm the complexation of the sulfonated titania inside the polymer matrix. The highest proton conductivity obtained was 0.091 S cm⁻¹ at 160 °C. The temperature dependent proton conductivity of the phosphoric acid doped proton conducting polymer electrolyte exhibits an Arrhenius relation and Grotthuss mechanism. Thermal gravimetric analysis (TGA) showed that all the prepared proton conducting polymer membrane exhibit good thermal stability. The morphological behaviors of the prepared proton conducting polymer electrolytes were depicted by scanning electron microscope (SEM) micrograph. The prepared composite membranes were characterized by proton conductivity, durability and mechanical strength. The acid uptake of the PBI-sulfonated titania blended membrane was found to be higher than that of the pristine PBI. The fabricated composite membrane with the highest conductivity exhibited a maximum current density of 0.89 A cm⁻² through the high proton conductivity.

通过溶剂浇铸技术制备了用于高温高分子电解质膜（HT-PEM）燃料电池的聚苯并咪唑（PBI）磺化纳米二氧化钛（S-TiO ₂）聚合物复合膜。X射线衍射（XRD）和傅立叶变换红外（FTIR）光谱用于表征聚合物结构并确认磺化二氧化钛在聚合物基质内部的络合。获得的最高质子电导率为0.091 S cm ^-1在160°C下。磷酸掺杂的质子传导聚合物电解质的温度依赖性质子传导率表现出阿累尼乌斯关系和格罗特斯斯机制。热重分析（TGA）表明，所有制备的质子传导聚合物膜均表现出良好的热稳定性。通过扫描电子显微镜（SEM）显微照片描绘了所制备的质子传导聚合物电解质的形态学行为。制备的复合膜的特征在于质子传导性，耐久性和机械强度。发现PBI-磺化二氧化钛混合膜的酸吸收高于原始PBI的酸吸收。具有最高电导率的复合膜的最大电流密度为0.89 A cm ^-2 通过高质子传导性。