Synthesis of high-performance electrochromic thin films by a low-cost method. Issue 6 (15th March 2021)

• Record Type: Journal Article
• Authors: Liu, Yangbiao; Wang, Jixi; Xiao, Xiudi; Cai, Xuesong; Sheng, Guizhang; Xu, Gang
• Is Part Of: Ceramics international. Volume 47:Issue 6(2021)
• Page Start: 7837
• Page End: 7844
• Publication Date: 2021-03-15
• Subjects: Electrochromic -- Mo-doped WO3 film -- Optical modulation -- Coloration efficiency; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.11.130
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Metal-doping is an effective method to adjust the physical and chemical properties of semiconductor metal oxides. This work adopts a simple solvothermal method to synthesize Mo-doped tungsten oxide nanoparticles. The high-performance electrochromic films can be homogenously formed on ITO glass without post-annealing. Compared with pure WO3 films, the optimized Mo-doped WO3 films show improved electrochromic properties with significant optical contrast (68.3% at 633 nm), the short response time (6.3 s and 3.9 s for coloring and bleaching, respectively), and excellent coloration efficiency (107.2 cm 2 C −1 ). The improved electrochromic behavior is mainly due to the increasing diffusion rate of Li + in Mo-doped WO3 films (increased 20% than that of pure WO3 films). The porous surface of Mo-doped WO3 film shortens the diffusion path of Li + . Besides, Mo doping reduces the resistance and improves conductivity. Furthermore, 2at% Mo-doped WO3 films indicate satisfactory energy-storage properties (the specific capacitance is 73.8 F g −1 ), resulting from the enhanced electrochemical activity and fast electrical conductivity. This work presents a practical and economical way of developing high-performance active materials for bifunctional electrochromic devices.