In this study, proton-conducting sulfonated polyether ether ketone (sPEEK) membranes including tungstic acid, organically modified montmorillonite, and silicon dioxide were prepared using solution casting method for direct methanol fuel cells. All obtained composite membranes had adequate thermal stability for fuel cells, and their surfaces became more hydrophilic due to the incorporation of additives. The ion exchange capacities of the composite membranes were found to be very close to the sPEEK membrane. While the proton conductivity of the sPEEK membrane was 8.6 mS cm⁻¹, the addition of additives led to an enhancement in the proton conductivity values. Among the prepared composite membranes, sPEEK-H₂WO₄-5 had the highest proton conductivity (36.5 mS cm⁻¹) which was comparable to Nafion117 in water at room temperature. On the other hand, the methanol permeabilities of the composite membranes were in the same order compared to sPEEK but showed minor changes depending on the added materials and their compositions. Among the membranes obtained by solution casting, sPEEK-H₂WO₄-5 was found to be the best composite membrane due to its high proton conductivity and acceptable methanol permeability. Layer-by-layer modified sPEEK membranes were also obtained in the study for comparison and it was found that sPEEK-PAH/H₂WO₄-2 displayed the best selectivity value.

中文翻译：

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不同无机填料的 sPEEK 基复合膜与不同制备路线的 DMFC 的比较研究

在这项研究中，采用溶液浇铸法制备了包含钨酸、有机改性蒙脱石和二氧化硅的质子传导磺化聚醚醚酮（sPEEK）膜，用于直接甲醇燃料电池。所有获得的复合膜都具有足够的燃料电池热稳定性，并且由于添加剂的加入，它们的表面变得更加亲水。发现复合膜的离子交换容量非常接近 sPEEK 膜。虽然sPEEK膜的质子电导率为8.6mS cm ^-1，但添加剂的添加导致质子电导率值的提高。所制备的复合膜中，sPEEK-H ₂ WO ₄ -5 的质子电导率最高（36.5 mS cm）⁻¹ ) 与室温下水中的 Nafion117 相当。另一方面，复合膜的甲醇渗透率与 sPEEK 处于同一数量级，但根据添加的材料及其组成而显示出较小的变化。在通过溶液流延获得的膜中，sPEEK-H ₂ WO ₄ -5由于其高质子传导性和可接受的甲醇渗透性而被认为是最好的复合膜。研究中还获得了逐层改性的sPEEK膜进行比较，发现sPEEK-PAH/H ₂ WO ₄ -2表现出最佳的选择性值。