Size Engineering of Ti₃C₂T_x Nanosheets for Enhanced Supercapacitance Performance.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional transition metal carbides (MXenes), specifically Ti3C2Tx, are promising for energy storage.
• The relationship between MXene lateral size and electrochemical properties is crucial for device optimization.

Purpose of the Study:

• To investigate the impact of Ti3C2Tx nanosheet lateral dimensions on electrochemical performance.
• To develop an electrode strategy combining varied nanosheet sizes for enhanced energy storage.

Main Methods:

• Synthesis of Ti3C2Tx nanosheets with controlled lateral dimensions.
• Fabrication of electrodes using a mixture of small and large Ti3C2Tx nanosheets.
• Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge at various scan rates.

Main Results:

• Achieved a high volumetric capacitance of approximately 658 F/g at low scan rates.
• Demonstrated robust capacitive retention even at a high scan rate of 10 V s-1.
• The mixed-size nanosheet approach significantly improved energy storage performance.

Conclusions:

• Lateral size is a critical factor influencing the electrochemical performance of Ti3C2Tx nanosheets.
• Combining small and large Ti3C2Tx nanosheets offers a viable strategy for high-performance electrochemical energy storage.
• The developed electrode material shows great potential for fast-response, high-power electrochemical energy storage devices.