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Self-Powered Flexible Multicolor Electrochromic Devices for Information Displays.

Wenzhao Xue¹, Yun Zhang¹, Feng Liu¹

¹School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P.R. China.

Research (Washington, D.C.)

|September 18, 2023

Summary

Researchers developed self-powered flexible multicolor electrochromic (EC) displays using a novel trilayer structure. These displays achieve color switching via a self-charging mechanism, eliminating the need for external power sources.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Developing self-powered flexible multicolor electrochromic (EC) systems without external power is challenging.
Existing EC devices often require external power for color switching and information display.

Purpose of the Study:

To propose a novel trilayer film structure for self-powered flexible multicolor EC displays.
To demonstrate a self-charging/discharging mechanism for reversible color switching.
To explore applications such as information display and writing boards.

Main Methods:

Fabrication of a trilayer film: ionic gel sandwiched between nickel hexacyanoferrate (NiHCF) and Prussian blue (PB) nanoparticle films on indium tin oxide substrates.
Assembly of a self-powered EC display by selectively connecting an aluminum wire as an anode.
Utilizing a color overlay effect for multicolor switching (green, blue, yellow, colorless).

Main Results:

The EC display achieved independent, self-powered color switching of NiHCF and PB films with fast response times and high reversibility.
Multicolor switching was realized through a color overlay effect.
Demonstrated pattern creation via spray-coating and a self-powered ionic writing board.

Conclusions:

The proposed trilayer structure enables self-powered, flexible, multicolor EC displays with self-recovered energy.
The design offers new insights for developing advanced EC systems for diverse applications.
The technology facilitates self-powered information display and interactive writing surfaces.