New Coating TENG with Antiwear and Healing Functions for Energy Harvesting

Abstract

In view of the limitations of practical applications of current triboelectric nanogenerators (TENGs), a new type of coating TENGs with antiwear and healing properties have been fabricated to collect the large-scale dissipative energy in the environment. To enhance the triboelectrification performance of the coating TENG, mesoporous silica filled with perfluorooctylethanol is added to the acrylate resin material, in addition to improving the antiwear properties of the frictional coating. The result shows that when the mesoporous silica is used as a carrier and perfluorooctylethanol is loaded, the short-circuit current (I sc ) and output voltage (V o ) of the coating TENG reach as high as 10 μA and 220 V, respectively, which are 4−5 times higher than those of pure acrylate. More importantly, the coefficient of friction of the new coating decreases from 0.11 to 0.04 with the wear volume reducing by approximately 89%, indicating a better friction-reducing property of the coating for long-term working. As a new coating material based on the traditional acrylic resin, it can be widely sprayed onto various walls, metals, and hulls as protection coating as well as power-generation coating. Interestingly, when the coating is damaged due to long-term aging or external mechanical forces, it can restore its triboelectric performance by encapsulating the repair agent within the pore structure of silica. Owing to the large-area fabrication, low cost, high output performance, and antiwear properties, the new coating TENGs have promising potential for practical applications in energy-harvesting, self-energy supplies, and self-powered sensors.

Self-Powered Acceleration Sensor Based on Multilayer Suspension Structure and TPU-RTV Film for Vibration Monitoring

“…RTV’s dielectric constant is in the range of 3.5~3.6 [ 30 ], and the dielectric constant of TPU is in the range of 6~7 [ 31 ] (room temperature, 50 Hz). The maximum transferred charge density σ′ can be expressed as Equation (7) [ 32 , 33 ]. where σ d , d gap , d coating , and ε coating are the triboelectric charge densities at the equilibrium state, gap distance, thickness of the TPU-RTV film, and dielectric constant of the TPU-RTV film, respectively.…”

Self-Cleaning and Shape-Adaptive Triboelectric Nanogenerator-Contained TiO2 Nanoparticle Coating

“…Recently, triboelectric nanogenerators (TENGs) based on the coupling of friction electrification and electrostatic induction effect − have developed rapidly due to their low-cost, simple design, diversity of materials and devices, and environmental friendliness, especially the wearable TENG device, such as electronic skin and self-powered functional systems. − However, the related electronic skin and wearable device based on TENGs is inevitably exposed to a certain level of contaminants during daily work. Therefore, the electrification materials of TENGs with the self-cleaning function are beneficial to the application of TENGs in the field of wearable devices. , At present, there are two kinds of self-cleaning surfaces: super-hydrophobic surface (physical self-cleaning) , and photocatalytic surface (chemical self-cleaning). − Photocatalysis has been reported to degrade macromolecular organic pollutants into small molecules of carbon dioxide (CO 2 ) and water (H 2 O) under the excitation of light, which can be combined with TENGs to show self-cleaning electrification surface. − For example, Liu et al have produced TENGs with a self-cleaning function by loading TiO 2 NPs on porous PDMS .…”

Electret-Doped Polarized Nanofiber Triboelectric Nanogenerator with Enhanced Electrical Output Performance Based on a Micro-Waveform Structure

“…The development of composites with various friction materials, 21,22 modification of friction materials, 23,24 and structural design based on friction layers 25,26 are relatively simple, common, and effective methods to increase the amount of surface charge of friction materials. For example, Kong prepared a TENG through adding mesoporous silica filled with perfluorooctyl-ethanol to acrylate resin material, exhibiting enhanced electrical output performance with an output voltage of 220 V. 27 Li et al modified a Kapton film through low-energy ion irradiation, which induced a high surface charge density of 332 μC/m 2 . 28 Cheng et al fabricated a soft-contact spherical TENG by optimizing both the material and structural design.…”

“…For example, Kong et al . prepared a TENG through adding mesoporous silica filled with perfluorooctyl-ethanol to acrylate resin material, exhibiting enhanced electrical output performance with an output voltage of 220 V . Li et al .…”