Boosting the electrochromic properties by large V2O5 nanobelts interlayer spacing tuned via PEDOT

• Published in: Chinese chemical letters Vol. 35; no. 9; pp. 109213 - 413
• Main Authors: Sun, Haohao, Wang, Wenxuan, Xiong, Yuli, Jian, Zelang, Chen, Wen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2024; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China%State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China; Sanya Science and Education Innovation Park of Wuhan University of Technology,Sanya 572000,China
• Subjects: Electrochromic; Interlayer spacing; Nanobelts; PEDOT; Vanadium oxide; Vanadium oxide; PEDOT; Nanobelts; Interlayer spacing; Electrochromic
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2023.109213

Vanadium pentoxide (V2O5) with a layered structure is of great interest in the field of electrochromic (EC) due to its abundance of color variations. However, there are still a series of problems such as slow ion diffusion, poor electronic conductivity and cyclic stability in the reaction process. Herein, we successfully prepared a stable and fast multi-color electrochromic material V2O5-PEDOT by a simple “one-pot” method. The layer space of V2O5 could be tuned by 3,4-ethylenedioxythiophene (named V2O5-PEDOT) during the dissolution and recrystallization of vanadium oxide. The expanded layer spacing facilitates rapid ion insertion and extraction. PEDOT serves as an internal conductive pillar to improve the overall conductivity of the material. The obtained intercrossing structure of the nanobelts shortens the ion diffusion distance and ensures electrolyte penetration. The V2O5-PEDOT exhibits the fast response time (1.1 s for coloration and 3.5 s for bleaching at 422 nm), high optical contrast (ΔT = 45% at 422 nm and ΔT = 35.2% at 1000 nm), great coloration efficiency (CE = 97.1 cm2/C), and high cyclic stability (86% preserved after 3000 cycles). The electrochromic devices (ECD) were successfully assembled by using V2O5-PEDOT films as ion storage layers and electrochromic layers, demonstrating remarkable performance. V2O5-PEDOT nanobelts with various layer spacings were successfully synthesized by in situ intercalation polymerization, which showed excellent electrochromic properties and provided a new idea for the field of smart window. [Display omitted]