Study on Two Inorganic Consumables in PMMA Electrochromic Devices Based on Work Function Differences

• Published in: ECS journal of solid state science and technology 2024-09, Vol.13 (9), p.93001
• Main Authors: Liu, Yuhang, Mengnan, Ruan, Nie, Shanshan, Lian, Yi, Zhao, Lei, Zhifeng, Liu
• Format: Article
• Language: English
• Subjects: Electrochromic Composite; PMMA Porous Materials; Porous Materials; SiO; TiO
• ISSN: 2162-8769; 2162-8777
• DOI: 10.1149/2162-8777/ad6808

In electrochromic devices, the dielectric layer is not only an electrode dielectric, but also can provide compensating ions for electrochromism. In this paper, three composite porous materials, PMMA/SiO 2 , PMMA/TiO 2 , and PMMA/SiO 2 /TiO 2 , were prepared and assembled using polymethyl cellulose (PMMA) as the polymer matrix, impurity medium (SiO 2 ) and titanium dioxide (TiO 2 ) inorganic polymers, and the effect of doping two inorganic porous materials on the electrochromic performance was studied. The optical recovery and cycle stability of electrochromic wear of the PMMA/SiO 2 /TiO 2 composite structure are significantly improved compared with the loss of other ceramic structures. Cyclic voltammetry analysis shows that the lithium ion diffusion coefficient of the electrochromic device using the PMMA/SiO 2 /TiO 2 composite ceramic structure is the largest, which is 2.5 × 10 −14 cm 2​ s −1 . The improvement of electrochromic performance is mainly due to the difference in work function between SiO 2 and TiO 2 on the figure of merit diagram, which leads to the directional movement of the resonator, accelerates the transmission rate of Li + and further optimizes the electrochemical properties of the composite ceramic. This study provides an effective method to improve the performance of electrochromic devices.