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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
PubMed
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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.
Keywords:
electrochromic deviceintercalationnanosheettungsten trioxide

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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.