Ferroelectricity-Coupled 2D-MXene-Based Hierarchically Designed High-Performance Stretchable Triboelectric...

Area of Science:

• Materials Science
• Nanotechnology
• Energy Harvesting

Background:

• Triboelectric nanogenerators (TENGs) offer potential for self-powered electronics but require advanced nanomaterials and device engineering.
• Understanding nanomaterial properties is crucial for microstructural engineering in TENGs.
• Current TENGs face challenges in achieving high performance and stretchability.

Purpose of the Study:

• To demonstrate a high-performance, stretchable TENG with enhanced energy conversion efficiency.
• To investigate the role of a hierarchically engineered composite material in improving TENG performance.
• To explore the potential applications of the developed TENG in sensing and vital-sign monitoring.

Main Methods:

• Fabrication of a stretchable TENG using interlocked microstructural configuration.
• Integration of silver-nanowire electrodes with a composite of thermoplastic polyurethane (TPU), barium titanate (BTO), and 2D MXene (Ti3C2Tx) nanosheets.
• Utilizing quantum-mechanical calculations to understand the electronic structure and energy conversion mechanism.

Main Results:

• Achieved a stretchable TENG with high performance (∼60% strain).
• Demonstrated enhanced output performance due to increased dielectric constant and lowered dielectric loss by BTO-coupled MXene.
• Reported high energy-conversion efficiency (∼79%), pressure sensitivity (4.6 V/kPa and 2.5 mA/kPa), and power output (6.65 W/m2).
• Generated an open-circuit voltage of 260 V and short-circuit current of 160 mA/m2.

Conclusions:

• The developed TENG shows superior pressure sensitivity and efficiency, enabling self-powered applications.
• The hierarchical polymer nanocomposite and device design are key to the outstanding energy-harvesting performance.
• This work is expected to drive advancements in next-generation self-powered technology and multifunctional electronics.