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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Ultra-stable aqueous electrochromism based on [EMIM]+/I3 - coordination
Fengjiao Meng1, Junsen Zhong1, Xiaoqian Tan1
1School of Environment and Materials Engineering, Yantai University Yantai 264005 China fyjiang@ytu.edu.cn kanglitao@ytu.edu.cn.
Chemical Science
|October 15, 2025
Summary
This study introduces a novel electrochromic (EC) window system using iodine electrodeposition. The new design overcomes durability issues in traditional EC windows, offering rapid switching and high performance for smart window applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy
Background:
- Electrochromic (EC) windows offer tunable optical properties but face commercialization hurdles like poor durability and high costs.
- Traditional EC windows suffer from ion-trapping, degradation, and corrosion, limiting their practical application.
Purpose of the Study:
- To develop a facile and high-performance EC system that addresses the durability limitations of conventional EC windows.
- To investigate a novel EC system based on the reversible electrodeposition of iodine.
Main Methods:
- Proposed a facile EC system utilizing reversible iodine electrodeposition.
- Modified the electrolyte with [EMIM]+ to suppress polyiodide shuttling and improve Zn electrode stability.
- Fabricated and tested a large-area (10 × 10 cm2) EC window device.
Main Results:
- The novel EC system demonstrated rapid response times (7s coloring, 6s bleaching) and high optical modulation (89.6%).
- Achieved excellent coloration efficiency (44.8 cm2 C-1) and an extended lifetime over 10,000 cycles without performance decay.
- Successfully demonstrated the scalability of the system with a large-area device.
Conclusions:
- The proposed I2-Zn EC window system offers a promising solution for durable and high-performance smart windows.
- The electrolyte modification effectively mitigates polyiodide shuttling and enhances electrode stability, leading to superior device longevity.
- This facile and scalable approach paves the way for the commercialization of advanced EC window technologies.
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