Smart Energy Storage: W₁₈O₄₉ NW/Ti₃C₂T_x Composite-Enabled All Solid State Flexible Electrochromic Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Developing efficient electrochromic energy storage devices is crucial for practical energy-saving applications.
• Existing materials often lack sufficient stability, color fluctuation, and electrochemical performance.
• There is a need for advanced materials that combine high storage capacity with dynamic optical properties.

Purpose of the Study:

• To fabricate a highly stable W18O49 NW/Ti3C2Tx composite material.
• To achieve a large electrochemical storage capacity and significant color fluctuation.
• To develop a bifunctional electrochromic supercapacitor with enhanced performance and durability.

Main Methods:

• Fabrication of a W18O49 NW/Ti3C2Tx composite.
• Deposition onto a conductive network using the Langmuir-Blodgett technique.
• Fabrication of a symmetric electrochromic supercapacitor device.

Main Results:

• The hybrid electrode demonstrated an areal capacitance of 125 mF cm⁻² with fast switching.
• The device achieved an energy density of 10.26 µWh cm⁻² and a power density of 0.605 mW cm⁻².
• High capacity retention (>4000 cycles), optical modulation (98.2%), and mechanical flexibility were observed.

Conclusions:

• The W18O49 NW/Ti3C2Tx composite electrode is a promising material for bifunctional electrochromic supercapacitors.
• The fabricated device exhibits excellent electrochemical and electrochromic performance with long-term stability.
• The material's properties suggest suitability for practical energy-saving and display applications.