Spray-Coated W₁₈O₄₉/Ti₃C₂T_x MXene Electrodes for High-Performance Electrochromic Energy Storage Devices.

Area of Science:

• Materials Science
• Nanotechnology
• Energy Storage

Background:

• Smart windows offer tunable light modulation and energy storage.
• Tungsten oxide is a common electrochromic material but has limitations.
• MXenes offer unique properties for material enhancement.

Purpose of the Study:

• To improve electrochromic and energy storage performance of tungsten oxide.
• To explore the synergistic effects of Ti3C2Tx MXene and W18O49.
• To develop advanced materials for smart windows and energy systems.

Main Methods:

• Solvothermal synthesis with solvent variation to create Ti3C2Tx-W18O49 composites.
• Characterization of electrochromic and energy storage properties.
• Fabrication and testing of a complementary electrochromic device (CECD).

Main Results:

• A 5 wt.% Ti3C2Tx-W18O49 composite (5MX-WO) showed 72% optical modulation and rapid switching.
• High coloration efficiency (182 cm2 C-1) and areal capacitance (25 mF cm-2) were achieved.
• The CECD demonstrated 61% optical modulation and excellent cyclic stability over 1000 cycles.

Conclusions:

• Ti3C2Tx incorporation significantly enhances electrochromic and energy storage performance.
• The composite material offers improved electronic and ionic transport.
• These W18O49/Ti3C2Tx composites show promise for next-generation electrochromic energy storage systems.