Cai Guofa, Cui Mengqi, Kumar Vipin, Darmawan Peter, Wang Jiangxin, Wang Xu, Lee-Sie Eh Alice, Qian Kai, Lee Pooi See
School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore . Email:
Chem Sci. 2016 Feb 1;7(2):1373-1382. doi: 10.1039/c5sc03727a. Epub 2015 Nov 12.
Porous WO films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching speed (6 and 2.7 s), high coloration efficiency (118.3 cm C), and excellent cycling stability are achieved by the porous WO on ITO-coated glass. The outstanding electrochromic performances of the porous WO film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the WO during H insertion compared to that of the compact structure. In addition, the relationships between the structural and electrochemical activity of the electrochromic WO films were further explored by the scanning electrochemical microscopy. These results testify that the porous structure can promote the infiltration of electrolyte and reduce the diffusion path, which consequently enhance the electrochemical activity.
通过一种新颖、简便且经济的脉冲电化学沉积方法，在不同衬底上成功制备了具有超高透射率调制的多孔WO薄膜，每个脉冲之间的间隔时间为1.1秒。在涂有ITO的玻璃上的多孔WO实现了近乎理想的光学调制（633nm处为97.7%）、快速切换速度（6秒和2.7秒）、高显色效率（118.3 cm C）以及优异的循环稳定性。多孔WO薄膜出色的电致变色性能主要归因于其多孔结构，与致密结构相比，该结构有利于电荷转移，促进电解质渗透，并减轻了H插入过程中WO的膨胀。此外，通过扫描电化学显微镜进一步探索了电致变色WO薄膜的结构与电化学活性之间的关系。这些结果证明，多孔结构可以促进电解质的渗透并缩短扩散路径，从而增强电化学活性。
