Performance-Enhanced Triboelectric Nanogenerator Based on the Double-Layered Electrode Effect.

Area of Science:

• Materials Science
• Nanotechnology
• Energy Harvesting

Background:

• Triboelectric nanogenerators (TENGs) are actively studied for performance enhancement via interface nanostructures.
• Water-assisted oxidation (WAO) improves TENG electrical performance by increasing contact area with an Al2O3 layer.
• WAO has deficiencies that limit its full potential for TENG enhancement.

Purpose of the Study:

• To develop a novel double-layered bottom electrode TENG (DE-TENG) to overcome WAO limitations.
• To enhance the electrical output performance of TENGs through a new fabrication approach.
• To demonstrate the potential of the fabricated DE-TENG for self-powered sensing applications.

Main Methods:

• Fabrication of a DE-TENG using metal deposition after WAO.
• Characterization of the metal-dielectric-metal sandwich structure using field emission scanning electron microscopy.
• Optimization of device performance by adjusting Cu layer sputtering time.

Main Results:

• The DE-TENG achieved approximately double the electrical output compared to WAO-TENG alone.
• Theoretical demonstration confirmed a double capacitance structure contributing to enhanced output.
• Optimal sputtering time for maximum electrical output was identified.
• Exceptional durability was proven through a 1-hour endurance test under varying humidity.

Conclusions:

• The novel DE-TENG fabrication method significantly boosts electrical energy generation.
• The device exhibits high sensitivity (0.82 V/N) for self-powered force sensing.
• The DE-TENG is a durable, easily fabricated, and promising technology for future self-powered energy harvesting.