Research On Liquid-Based Nanogenerator With High Charge Desity For Self-Powered Devices

Liquid-based triboelectric nanogenerator（L-TENG）is a new type of energy conversion technology that can collect low-frequency mechanical energy from the surrounding environment,providing a feasible solution for self-powering of microelectronic devices represented by sensors.Here,a tubular L-TENG（TL-TENG）based on fluoroalkyl（FDTES）monolayer modified silica（SiO₂）was designed and fabricated by the self-assembed monolayer.It exhibited the excellent electric output with an output voltage of 101.5 V,peak power density of 43.0 m W m^-2,surface charge density of 500.3μC m^-2,and durability of no less than 5.12×10⁵ cycles,far exceeding that of the same type of TL-TENG reported previously.The electric output could be modulated by the thickness of dielectric layer,types of liquid,and oscillation frequency,which was reasonably explained by the equivalent capacitor model proposed in this paper.In addition,the hydrophobic fluoroalkyl monolayer could promote the electron transfer at the solid-liquid interface,and the existence of a dielectric layer could inhibit the leakage of the current perpendicular to the surface,both leading to the enhancement of electric output.A wearable TL-TENG was finally demonstrated to harvest body motion energy and power lighting devices efficiently.The work of this paper reveals the effect of carrier behavior at the liquid-solid interface on the electric output of TL-TENG,and provides theoretical guidance for TL-TENG’s design.This kind of TL-TENG possesses great application potential in the fields of energy harvesting and self-powered wearable devices in the wild.