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New coating TENG with anti-wear and healable functions for energy harvesting.

In view of the limitations of current triboelectric nanogenerators (TENGs) for practical applications, a new type of coating TENGs with anti-wear and healable properties is fabricated to collect the large-scale dissipative energy in environment. To enhance triboelectrification performance of the coating TENG, mesoporous silica filled with perfluorooctylethanol is added to the acrylate resin material, as well as improving the anti-wear properties of the frictional coating. The result shows that when the mesoporous silica is used as a carrier and loaded perfluorooctylethanol, the short-circuit current (Isc) and output voltage (Vo) of the coating TENG reach as high as 10 µA and 220 V, respectively, which are 4-5 times higher than those based on 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 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 the protection coatings as well as the 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 anti-wear properties, the new coating TENGs have promising value for practical applications in energy harvesting, self-energy supplies, and self-powered sensors.