Flexible Ti₃C₂T_x MXene Film Coupled with Defect-Rich MoO₃ Spacer-Contributor toward High-Performance Wearable Energy...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Flexible supercapacitors are crucial for wearable electronics.
• Current MXene-based devices face limitations in capacitive performance under mechanical stress.

Purpose of the Study:

• To develop a novel flexible electrode material for enhanced supercapacitor performance.
• To improve the capacitive characteristics and mechanical stability of MXene-derived electrodes.

Main Methods:

• Fabrication of MX/D-MoO3 composite electrodes using Ti3C2Tx MXene film (MX) and defect-rich MoO3 (D-MoO3).
• Characterization of electrode properties, including layer spacing, electrochemical active sites, specific capacitance, energy density, and power density.
• Testing of device stability and mechanical flexibility under cyclic loading and bending.

Main Results:

• Intercalation of D-MoO3 enlarged Ti3C2Tx layer spacing and boosted electrochemical active sites.
• MX/D-MoO3-60 exhibited a specific capacitance of 2734.3 mF cm-2, a 342% increase over raw MX.
• The all-solid-state supercapacitor demonstrated high energy density (96.3 µWh cm-2) and power density (1871.4 µW cm-2).
• Excellent stability (91.8% capacitance retention after 5000 cycles) and mechanical flexibility (90.3% retention under 180° bending) were achieved.

Conclusions:

• The developed MX/D-MoO3 composite electrode offers superior electrochemical performance and mechanical flexibility.
• This material shows significant promise for advanced wearable energy storage applications.
• The facile preparation method further supports its potential for practical implementation.