Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA.
Nano Lett. 2010 Sep 8;10(9):3785-90. doi: 10.1021/nl102581w.
In this paper, we report the high proton conductivity of a single high-purity Nafion nanofiber (1.5 S/cm), which is an order of magnitude higher than the bulk Nafion film ( approximately 0.1 S/cm). We also observe a nanosize effect, where proton conductivity increases sharply with decreasing fiber diameter. X-ray scattering provides a rationale for these findings, where an oriented ionic morphology was observed in the nanofiber in contrast to the isotropic morphology in the bulk film. This work also demonstrates the successful fabrication of high-purity Nafion nanofibers ( approximately 99.9 wt %) via electrospinning and higher humidity sensitivity for nanofibers compared to the bulk. These results should have a significant impact on fuel cells and sensors.
在本文中，我们报告了单根高纯度 Nafion 纳米纤维（1.5 S/cm）的高质子电导率，比大块 Nafion 薄膜（约 0.1 S/cm）高出一个数量级。我们还观察到纳米尺寸效应，其中质子电导率随着纤维直径的减小而急剧增加。X 射线散射为这些发现提供了依据，其中在纳米纤维中观察到取向的离子形态，而在大块薄膜中则观察到各向同性形态。这项工作还通过静电纺丝成功制备了高纯度 Nafion 纳米纤维（约 99.9wt%），与大块相比，纳米纤维具有更高的湿度敏感性。这些结果应该对燃料电池和传感器产生重大影响。
