Here we present the enhanced electrochemical properties of ion gel nanofiber-based electrochromic devices (ECDs) prepared by electrospinning. The ECDs were fabricated by sandwiching prepared electrospun nanofiber webs between two transparent electrodes. The electrochromic behaviors of the ECDs were investigated using cyclic voltammetry, spectroelectrochemistry, and kinetic stability measurements. In order to determine the origin of the enhanced EC behaviors, the morphological structures of the nanofiber were examined by a scanning electron microscope, which showed that an ionic liquid (IL) region enclosed the pores between the nanofibers in the solid phase. The increased IL contents in the interstices of the nanofibers were noted, which would induce higher ionic mobility. Consequently, the fabricated nanofiber-based ECDs showed greatly enhanced device performance in terms of switching speed, cyclic stability, and coloration efficiency. Furthermore, flexible ECDs were fabricated by sandwiching the electrospun webs between two plastic electrodes consisting of silver nanowire/PEDOT:PSS hybrid electrodes. The fabricated device revealed a color switching over the large active area, with the transmittance changes maintained over repeated bending cycles. These nanofiber-based ECDs are evidence of a practical approach by which to realize large-area electrochromic devices with excellent chromatic switching and long-term cyclic stability, suitable both for rigid and flexible devices.

在这里，我们介绍了通过电纺丝制备的基于离子凝胶纳米纤维的电致变色器件（ECD）的增强的电化学性能。通过将准备好的电纺纳米纤维网夹在两个透明电极之间来制造ECD。使用循环伏安法，光谱电化学法和动力学稳定性测量方法研究了ECD的电致变色行为。为了确定增强的EC行为的起源，通过扫描电子显微镜检查了纳米纤维的形态结构，其显示离子液体（IL）区域包围了固相中纳米纤维之间的孔。注意到在纳米纤维的间隙中IL含量增加，这将引起更高的离子迁移率。所以，制备的基于纳米纤维的ECD在开关速度，循环稳定性和着色效率方面显示出大大增强的器件性能。此外，通过将电纺网夹在两个由银纳米线/ PEDOT：PSS混合电极组成的塑料电极之间来制造柔性ECD。所制造的装置显示出在较大的有效区域上的颜色切换，并且在重复的弯曲循环中保持了透射率变化。这些基于纳米纤维的ECD证明了一种实用的方法，可通过该方法实现具有出色的色彩切换和长期循环稳定性的大面积电致变色器件，适用于刚性和柔性器件。通过将电纺网夹在两个由银纳米线/ PEDOT：PSS混合电极组成的塑料电极之间来制造柔性ECD。所制造的装置显示出在较大的有效区域上的颜色切换，并且在重复的弯曲循环中保持了透射率变化。这些基于纳米纤维的ECD证明了一种实用的方法，通过该方法可以实现具有出色的色彩切换和长期循环稳定性的大面积电致变色器件，适用于刚性和柔性器件。通过将电纺网夹在两个由银纳米线/ PEDOT：PSS混合电极组成的塑料电极之间来制造柔性ECD。所制造的装置显示出在较大的有效区域上的颜色切换，并且在重复的弯曲循环中保持了透射率变化。这些基于纳米纤维的ECD证明了一种实用的方法，可通过该方法实现具有出色的色彩切换和长期循环稳定性的大面积电致变色器件，适用于刚性和柔性器件。