燃料电池硅钨酸掺杂有机硅质子交换膜

Study of novel proton exchange membrane by mixing polyoxometalacids with organo-silicane used in fuel cell

为了寻找质优价廉且易于制备的新型聚合物来取代现用价高难制备的全氟磺酸聚合物作为质子交换膜燃料电池(PEMFC)的质子交换膜(PEM),达到大幅度降低PEMFC成本的目的,以具有环氧乙烷结构的有机硅烷为原料,采用低温溶胶-凝胶法再配之以掺杂无机杂多酸硅钨酸的方法来制备新型有机-无机复合型质子交换膜,并采用红外光谱(FI-IR)、X射线衍射(XRD)、阻抗分析等实验方法对膜的结构和电性能进行了较深入地研究。研究结果表明,所制备的硅钨酸掺杂的有机硅聚合物分子中存在聚氧乙烯(PEO)结构,掺杂的硅钨酸(STA)通过分子间的化学键作用镶嵌在聚合物的内部;所制备的含有30%STA的硅钨酸掺杂有机硅聚合物质子交换膜在100℃的质子传导率为2.0×10-2S/cm,与市售Nafion115膜的性能基本相当。

A novel organic-inorganic hybrid membrane used in proton exchange membrane fuel cell was fabricated by gel-sol with organo-silicane as starting material. After adding polyoxometalacids (STA or PWA) into precursor solution, the proton conductivity of hybrid membrane was improved greatly. The new membrane containing 30% silicotungstic acid (STA), which was fabricated by gel-sol in our experiment, had the similar performances to Nafion115 membrane. The proton conductivity of the fabricated composite was high, and increased up to 2.0×10-2 S/cm with the temperature increased.