A Multifunction Freestanding Liquid-Solid Triboelectric Nanogenerator Based on Low-Frequency Mechanical Sloshing.

Area of Science:

• Materials Science
• Energy Harvesting
• Nanotechnology

Background:

• Triboelectric nanogenerators (TENGs) are promising for harvesting ambient mechanical energy.
• Liquid-solid interfaces offer unique opportunities for TENG design and performance.

Purpose of the Study:

• To develop and characterize a freestanding liquid-solid triboelectric nanogenerator (LS-TENG) for low-frequency mechanical energy harvesting.
• To investigate the influence of various parameters on the LS-TENG's output performance and analyze its electrification mechanism.

Main Methods:

• Fabrication of a rectangular LS-TENG using fluorinated ethylene propylene (FEP) films and deionized water (DI).
• Testing the LS-TENG under low-frequency (2 Hz) mechanical shaking.
• Utilizing COMSOL Multiphysics software for mechanism analysis.
• Systematic study of liquid volume, types, and number of units on output.

Main Results:

• The LS-TENG demonstrated effective energy conversion with reliable stability at 2 Hz.
• Optimized conditions yielded high output: 120 V open-circuit voltage, 3.9 μA short-circuit current, and 133 nC transferred charge.
• Friction materials, liquid type, and unit configuration significantly impact performance.

Conclusions:

• The developed LS-TENG is a viable technology for harvesting low-frequency mechanical energy.
• Potential applications include capacitive storage, AC power generation, signal acquisition, and self-powered sensors.
• The device offers a practical route for multifunctional energy harvesting in natural environments.