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Continuous In-Situ Polymerization of Complex-Based Films for High-Performance Electrochromic Devices.

Yang-Bo Liu1,2, Hao-Tian Deng1,2, Li-Yi Zhang2

  • 1College of Chemistry, Fuzhou University, Fuzhou 350108, China.

Molecules (Basel, Switzerland)
|March 13, 2025
PubMed
Summary

A new continuous in situ polymerization method creates stable electrochromic films for advanced devices. This Schiff base condensation technique yields films with multiple color states and fast response times.

Keywords:
Schiff base condensationelectrochromic deviceselectrochromic filmelectrochromismin situ polymerization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • High-performance electrochromic devices require uniform and stable electrochromic films on conductive layers.
  • Developing convenient and feasible polymer film preparation technologies is crucial for advancing electrochromic applications.

Purpose of the Study:

  • To demonstrate a continuous in situ polymerization method for preparing electrochromic films.
  • To investigate the electrochromic properties and stability of the synthesized polymer films.

Main Methods:

  • Continuous in situ polymerization via Schiff base condensation of a tetraamine Fe-based complex and organic di-/tri-aldehyde precursors.
  • Coating the electrochromic film onto Indium Tin Oxide (ITO) glass.
  • Characterization of film morphology, stability, and electrochemical properties.

Main Results:

  • Uniform and stable electrochromic films were successfully coated on ITO glass.
  • Film P1 exhibited two reversible redox processes, enabling two-step electrochromism (Fe(II)/Fe(III) and triphenylamine oxidation).
  • Three stable color states (yellow, orange-red, blue) were achieved with fast response times (0.4–1.2 s) and high coloration efficiencies (241.5–352.9 cm²/C).

Conclusions:

  • The continuous in situ polymerization method offers a feasible strategy for creating high-performance electrochromic polymer films.
  • The developed films demonstrate excellent electrochromic performance suitable for advanced device applications.