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High-Performance Electrochromic Devices Based on Size-Controlled 2D WO3 Nanosheets Prepared Using the Intercalation
Cheng-Ai Li1, Boemjin Ko1, Kwang-Hyun Park1
1Division of Advanced Materials Engineering, Center for Advanced Powder Materials and Parts, Kongju National University, Cheonan 32588, Republic of Korea.
Materials (Basel, Switzerland)
|January 11, 2024
Summary
Synthesizing ultrathin tungsten trioxide (WO3) nanosheets is challenging. This study introduces a method using potassium ion intercalation and sonication to create high-performance WO3 nanosheets for electrochromic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Direct exfoliation of bulk tungsten trioxide (WO3) into ultrathin 2D nanosheets is hindered by strong interlayer bonding.
- Developing efficient methods for producing 2D WO3 nanosheets is crucial for advanced material applications.
Purpose of the Study:
- To synthesize ultrathin WO3 nanosheets with controllable sizes.
- To investigate the electrochromic performance of these synthesized WO3 nanosheets.
Main Methods:
- Potassium ion (K+) intercalation into WO3 powder.
- Exfoliation of intercalated WO3 using sonication and controlled temperature in N-methyl-2-pyrrolidone.
- Fabrication and testing of electrochromic devices using the exfoliated WO3 nanosheets.
Main Results:
- Successfully synthesized large quantities of individual 2D WO3 nanosheets via intercalation and sonication.
- Exfoliated WO3 nanosheets demonstrated superior electrochromic performance compared to bulk WO3 and non-intercalated exfoliated WO3.
- Small WO3 nanosheets achieved 41.78% optical modulation at 700 nm, with fast switching times (9.2s coloring, 10.5s bleaching) and retained 86% performance after 1000 cycles.
Conclusions:
- The K+ intercalation and sonication method effectively overcomes the exfoliation challenges of WO3.
- The synthesized ultrathin WO3 nanosheets exhibit excellent electrochromic properties and stability, making them promising for device applications.
