Boron Quantum Dots Pillared Ti₃ C₂ T_x Membrane Electrode with High Rate Performance for Supercapacitor

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Development of high-performance energy storage materials is crucial for portable and wearable electronic devices.
• Quantum dots and 2D materials offer unique properties for electrochemical applications.
• Boron quantum dots (BQDs) and Ti3C2Tx nanosheets (NSs) are promising candidates for supercapacitor electrodes.

Purpose of the Study:

• To develop a sonication-assisted liquid-phase preparation technique for boron quantum dots (BQDs).
• To fabricate a flexible BQDs(10)-Ti3C2Tx membrane electrode with enhanced capacitance.
• To assemble and characterize an all-solid-state flexible supercapacitor using the developed electrode.

Main Methods:

• Sonication-assisted liquid-phase synthesis of BQDs with controlled size and properties.
• Fabrication of BQDs(10)-Ti3C2Tx membrane electrodes using Ti3C2Tx NSs and BQDs.
• Assembly of an all-solid-state flexible supercapacitor with PVA/H2SO4 hydrogel electrolyte.

Main Results:

• BQDs exhibit a direct bandgap semiconductor nature with a 3 eV bandgap and 41 F g-1 specific capacitance.
• The BQDs(10)-Ti3C2Tx membrane electrode shows a specific capacitance of 524 F g-1 at 1 A g-1 with 75% capacity retention.
• The flexible supercapacitor achieves an area specific capacitance of 552 mF cm-2, 93% retention after 5000 cycles, and high energy/power densities.

Conclusions:

• The developed BQDs and BQDs(10)-Ti3C2Tx membrane electrode demonstrate excellent electrochemical performance.
• The all-solid-state flexible supercapacitor exhibits superior capacitance, stability, and flexibility.
• These findings highlight the potential of BQDs(10)-Ti3C2Tx for applications in portable and wearable electronic devices.