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首页> 外文期刊>Journal of power sources >Preparation and characterization of sulfonated PEEK-WC membranes for fuel cell applications. A comparison between polymeric and composite membranes
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Preparation and characterization of sulfonated PEEK-WC membranes for fuel cell applications. A comparison between polymeric and composite membranes

机译：用于燃料电池的磺化PEEK-WC膜的制备和表征。聚合物膜和复合膜之间的比较

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摘要

Sulfonated poly(etheretherketone) with a cardo group (SPEEK-WC) exhibiting a wide range of degree of sulfonation (DS) was used to prepare polymeric membranes and composite membranes obtained by incorporation of an amoiphous zirconium phosphate sulfophenylenphosphonate (Zr(HPO_4)(O_3PC_6H_4SO_3H), hereafter Zr(SPP)) in a SPEEK-WC matrix. The nominal composition of the composite membranes was fixed at 20 wt percent of Zr(SPP). Both types of membrane were characterized for their proton conductivity, methanol permeability, water and/or methanol uptake, morphology by SEM and mechanical properties. For comparison, a commercial Nation 117 membrane was characterized under the same operative conditions. The composite membranes exhibited a reduced water uptake in comparison with the polymeric membranes especially at high DS values and temperature higher than 50 deg C. As a result, the water uptake into composite membranes remained about constant in the range 20-70 deg C. The methanol permeability (P) of both polymeric and composite membranes was always lower than that of a commercial Nafion 117 membrane. At 22 deg C and 100 percent relative humidity (RH), the proton conductivities (sigma) of the polymeric membranes increased from 6 X 10~(-4) to 1 X 10~(-2) S cm~(-1) with the increase of DS from 0.1 to 1.04. The higher conductivity value was comparable with that of Nafion 117 membrane (3 X 10~(-2) S cm~(-1)) measured under the same operative conditions. The conductivities of the composite membranes are close to that of the corresponding polymeric membranes, but they are affected to a lesser extent by the polymer DS. The maximum value of the sigma/P ratio (about 7 X 10~4 at 25 deg C) was found for the composite membrane with DS = 0.2 and was 2.5 times higher than the corresponding value of the Nafion membrane.
机译：使用具有广泛磺化度（DS）的心脏基的磺化聚醚醚酮（SPEEK-WC）制备聚合物膜和通过掺入氨式磷酸锆磺基苯基膦酸酯（Zr（HPO_4）（O_3PC_6H_4SO_3H）获得的复合膜），以下称为SPEEK-WC矩阵中的Zr（SPP））。复合膜的标称组成固定为Zr（SPP）的20 wt％。两种类型的膜的特征在于它们的质子传导率，甲醇渗透性，水和/或甲醇吸收，通过SEM的形态和机械性能。为了比较，在相同的操作条件下表征了商品化的Nation 117膜。与聚合物膜相比，复合膜的吸水率降低，尤其是在高DS值和高于50摄氏度的温度下。结果，复合膜的吸水率在20-70摄氏度范围内保持恒定。聚合物膜和复合膜的甲醇渗透率（P）始终低于市售的Nafion 117膜。在22摄氏度和100％相对湿度（RH）下，聚合物膜的质子电导率（sigma）从6 X 10〜（-4）增加到1 X 10〜（-2）S cm〜（-1）， DS从0.1增加到1.04。在相同的操作条件下测得的电导率值可与Nafion 117膜的电导率（3 X 10〜（-2）S cm〜（-1））相媲美。复合膜的电导率接近相应的聚合物膜的电导率，但是它们受到聚合物DS的影响较小。发现DS ＝ 0.2的复合膜的sigma / P比的最大值（在25℃下约为7×10〜4），比Nafion膜的相应值高2.5倍。

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