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Related Concept Videos

Ion Exchange01:17

Ion Exchange

820
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
820

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A Self-Healing Ionic Liquid-Based Ionically Cross-Linked Gel Polymer Electrolyte for Electrochromic Devices.

Wanyu Chen1, Siyuan Liu1, Le Guo2

  • 1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.

Polymers
|March 6, 2021
PubMed
Summary

A novel ionic liquid-based gel polymer electrolyte was developed for electrochromic devices. This material offers fast switching, high efficiency, and excellent stability, paving the way for advanced smart window applications.

Keywords:
electrochromic deviceelectrolyteionic liquidsionically cross-linked gel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Electrochromic devices (ECDs) require stable and efficient electrolytes.
  • Traditional liquid electrolytes face challenges in terms of leakage and safety.
  • Gel polymer electrolytes offer a promising alternative with improved handling and safety.

Purpose of the Study:

  • To synthesize and characterize a novel ionic liquid-based ionically cross-linked gel polymer electrolyte (GPE-ILs).
  • To fabricate and evaluate the performance of electrochromic devices utilizing the developed GPE-ILs.
  • To assess the ionic conductivity, thermal stability, and self-healing properties of the GPE-ILs.

Main Methods:

  • Synthesis of GPE-ILs using acrylic acid, 2-diethylaminoethyl methacrylate, methyl methacrylate, and ionic liquids.
  • Fabrication of ECDs with a glass/FTO/WO3/GPE-ILs/FTO/glass architecture via laminating technology.
  • Performance testing including optical modulation, switching times, coloration efficiency, cycling stability, ionic conductivity, and thermal stability.

Main Results:

  • The fabricated ECDs achieved a large optical modulation of 49.9% at 650 nm.
  • Short switching times were observed: 7 s for coloration and 4 s for bleaching.
  • High coloration efficiency (96.2 cm2 C-1) and cycling stability (200 cycles) were demonstrated.
  • The GPE-ILs exhibited high ionic conductivity (3.19 × 10-3 S cm-1 at 25 °C) and stable ion migration over a wide temperature range (-10 to 80 °C).
  • The GPE-ILs showed superior thermal stability (5% weight loss at 300 °C) and good self-healing ability (retaining >80% tensile strength).

Conclusions:

  • The developed ionic liquid-based gel polymer electrolyte is a highly effective component for electrochromic devices.
  • The GPE-ILs offer a compelling combination of performance, stability, and safety features.
  • This research contributes to the advancement of smart window technologies and other electrochromic applications.