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首页> 外文期刊>Journal of Chemical Engineering of Japan >Cross-Linked PVA/PAA Fibrous Web Composite Membrane for Enhanced Performance of PEM Fuel Cells under High-Temperature and Low-Humidity Conditions
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Cross-Linked PVA/PAA Fibrous Web Composite Membrane for Enhanced Performance of PEM Fuel Cells under High-Temperature and Low-Humidity Conditions

机译：交联的PVA / PAA纤维网复合膜，用于在高温和低湿度条件下提高PEM燃料电池的性能

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摘要

A cross-linked poly(vinyl alcohol) (PVA)/poly(acrylic acid) (PAA) fibrous web supported composite ionomer (Aquivion) membrane was fabricated and evaluated for high-temperature and low-humidity proton exchange membrane fuel cell operations. PVA/PAA fibrous webs were initially prepared by the electrospinning method, followed by heat-treatment for cross-linking the polymers in order to increase mechanical strength. The successful formation of cross-linking bonds between PVA and PAA was confirmed by Fourier transform infrared spectroscopy analysis. For electrolyte membrane preparation in single cell tests, the fibrous webs were further impregnated with an Aquivion ionomer phase, which could be observed in scanning electron microscopy images. The prepared composite membrane had considerably improved mechanical strength compared to Aquivion-only membranes, as was evident by a 1.78-fold increase in tensile strength. Single cell and proton conductivity tests were also performed. The Aquivion-impregnated PVA/PAA fibrous composite membranes showed approximately 1.4-, 1.6-, and 1.2-fold higher maximum power densities than did the Aquivion-only membranes at 75°C/100% relative humidity (RH), 75°C/40% RH, and 120°C/40% RH, respectively. These results demonstrate the strong potential of the cross-linked PVA/PAA fibrous composite membranes impregnated with Aquivion for application to PEMFC operation at high temperatures and in low-humidity (>40% RH) regions.
机译：制备交联聚（乙烯醇）（PVA）/聚（丙烯酸）（PAA）纤维网支撑的复合离聚物（Aquivion）膜，并评估高温和低湿度质子交换膜燃料电池操作。最初通过静电纺丝方法制备PVA / PAA纤维网，然后进行热处理，用于交联聚合物以增加机械强度。通过傅里叶变换红外光谱分析证实了PVA和PAA之间的交联键的成功形成。对于单细胞试验中的电解质膜制剂，纤维网进一步浸渍有含水极离聚物相，可以在扫描电子显微镜图像中观察。与仅含水膜的膜相比，制备的复合膜具有相当大的机械强度，如抗拉强度的增加1.78倍。还进行单细胞和质子电导率试验。水浸渍的PVA / PAA纤维复合膜显示出比仅75℃/ 100％相对湿度（RH），75°C /的可采用膜更高的最大功率密度，所述最大功率密度约为1.4-，1.6-，1.2倍，最大功率密度。分别为40％RH和120°C / 40％RH。这些结果证明了浸渍有含水的交联PVA / PAA纤维复合膜的强潜力，用于在高温下和低湿度（> 40％RH）区域的PEMFC操作。

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