Zhang Ni, Zhong Chuanqing, Xie Bing, Liu Huiling, Wang Xingzu
J Nanosci Nanotechnol. 2014 Sep;14(9):7286-92. doi: 10.1166/jnn.2014.8950.
A series of TiO2/bi A-SPAES(Ds 1.0) composite membranes with various contents of nano-sized TiO2 particles were prepared through sol-gel method. Scanning electron microscopy (SEM) images indicated the TiO2 particles were well dispersed within polymer matrix. These membranes were used for proton exchange membrane (PEM) for performance evaluation in direct methanol fuel cell (DMFC). These composite membranes showed good thermal stability and mechanical strength. It was found that the water uptake of these membranes enhanced with the TiO2 amount increasing in these composite membranes. Meanwhile, the introduction of TiO2 particles increased the proton conductivity and reduced the methanol permeability. The proton conductivities of these composite membranes with 8% TiO2 particles (0.120 S/cm and 0.128 S/cm) were higher than those of Nafion 117 membrane (0.114 S/cm and 0.117 S/cm) at 80 degrees C and 100 degrees C. Specially, the methanol diffusion coefficient (1.2 x 10(-7) cm2/s) of the composite membrane with 8% TiO2 content was much lower than that of Nafion 117 membrane (2.1 x 10(-6) cm2/s). As a result, the TiO2/bi A-SPAES composite membrane was considered as a promising material for PEM in DMFC.
通过溶胶 - 凝胶法制备了一系列具有不同纳米TiO₂颗粒含量的TiO₂/双A - SPAES（Ds 1.0）复合膜。扫描电子显微镜（SEM）图像表明TiO₂颗粒在聚合物基体中分散良好。这些膜被用作质子交换膜（PEM），用于直接甲醇燃料电池（DMFC）的性能评估。这些复合膜表现出良好的热稳定性和机械强度。发现随着复合膜中TiO₂含量的增加，这些膜的吸水率提高。同时，TiO₂颗粒的引入提高了质子传导率并降低了甲醇渗透率。在80℃和100℃时，含8% TiO₂颗粒的这些复合膜的质子传导率（0.120 S/cm和0.128 S/cm）高于Nafion 117膜（0.114 S/cm和0.117 S/cm）。特别地，TiO₂含量为8%的复合膜的甲醇扩散系数（1.2×10⁻⁷ cm²/s）远低于Nafion 117膜（2.1×10⁻⁶ cm²/s）。因此，TiO₂/双A - SPAES复合膜被认为是DMFC中用于PEM的一种有前景的材料。
