Synergizing Color Modulation with Energy Storage Capabilities through MXene Doping: Hybrid Electrochromic...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Growing demand for flexible and wearable electronics necessitates advanced multifunctional devices.
• Existing electrochromic and energy storage technologies face limitations in performance and integration.

Purpose of the Study:

• To design and investigate a multifunctional Ti3C2 MXene-doped methyl viologen (MV) and Prussian blue (PB)-based electrochromic energy storage device (Ti3C2-ECESD).
• To enhance electrochromic properties and energy storage capabilities through material doping and optimized device configuration.

Main Methods:

• Utilized a 2-fold approach: role-specific component identification and density functional theory (DFT)-based simulation.
• Employed experimental in situ voltage-dependent Raman measurements to elucidate the working mechanism.
• Optimized the prebleaching step within the device configuration to prevent degradation.

Main Results:

• Achieved a high color contrast (84%), excellent coloration efficiency (506 cm²/C), and durable stability (>1400 s) with a fast switching speed (~1.4 s).
• Demonstrated good charge storage properties with a maximum specific capacitance of 33.4 mF/cm² at 0.4 mA/cm².
• Fabricated a flexible Ti3C2-ECESD prototype exhibiting robust performance under bending and twisting.

Conclusions:

• The Ti3C2 MXene doping significantly enhances electrochromic performance and energy storage in the MV/PB-based device.
• The developed flexible Ti3C2-ECESD is a promising candidate for next-generation wearable electronic gadgets.
• Optimized device fabrication and working mechanisms pave the way for practical multifunctional electronic applications.