Citation: Haohao Sun, Wenxuan Wang, Yuli Xiong, Zelang Jian, Wen Chen. Boosting the electrochromic properties by large V₂O₅ nanobelts interlayer spacing tuned via PEDOT[J]. Chinese Chemical Letters, ;2024, 35(9): 109213. doi: 10.1016/j.cclet.2023.109213 shu

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

Haohao Sun ^a ,
Wenxuan Wang ^a ,
Yuli Xiong ^{a, b, *,} ,
Zelang Jian ^{a, *,} ,
Wen Chen ^a

a.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
b.
Sanya Science and Education Innovation Park of Wuhan University of Technology, Sanya 572000, China

yuli.xiong@whut.edu.cn

zelangjian@whut.edu.cn

Received Date: 18 April 2023
Revised Date: 29 July 2023
Accepted Date: 16 October 2023
Available Online: 21 October 2023

Figures(7)

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.
- Vanadium oxide,
- PEDOT,
- Nanobelts,
- Interlayer spacing,
- Electrochromic
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Boosting the electrochromic properties by large V₂O₅ nanobelts interlayer spacing tuned via PEDOT