Water Drop Driven Triboelectric Nanogenerator Based On Titanium Tubes

The development and utilization of renewable energy is an important way to solve the problem of energy shortage.Triboelectric Nanogenerator（TENG）is a new energy conversion device that converts friction mechanical energy into electrical energy.Droplets and water flows can be seen everywhere in daily life,and the use of their flow to generate energy is one of the current research hotspots.Traditional TENG devices are usually based on a planar substrate,and the liquid is usually attached to the pipeline as a transmission carrier.There are few studies on the use of liquid flow in pipes to obtain energy,because the traditional planar friction layer materials and surface modification methods are not suitable for the inner surface of the pipe matrix with complex structure and narrow space.This topic proposes the construction of a single-electrode liquid-based triboelectric nanogenerator（Liquid-TENG）using a titanium dioxide（TiO₂）nanotube hydrophobic coating,and studies the effects of fluid and pipe characteristics on the output performance of the single-electrode L-TENG tube.This topic first builds a sheet-like single-electrode L-TENG device based on a planar titanium substrate,discusses the feasibility of TiO₂ nanotube hydrophobic coating as a friction layer,and studies the effect of TiO₂ nanotube structure on device performance.The application of tube devices lays the foundation.The experimental results show that the preparation of TiO₂ nanotube coatings with a tube length of less than 2μm using square wave pulse voltage for anodization can improve the output performance of single-electrode L-TENG.The short-circuit current and output voltage of the device based on TiO₂ nanotubes are～2.8 n A and～260 m V,respectively,and its output performance is significantly better than that of devices without TiO₂ nanotubes.Single-electrode L-TENG was constructed with traditional friction materials and TiO₂ nanotube hydrophobic coatings respectively.The output laws of the two devices were the same,which proved that TiO₂ nanotube hydrophobic coatings could be used as L-TENG friction layer materials.TiO₂ nanotube array coatings were prepared on the inner surface of the titanium tube by coaxial anodization,and modified with low surface energy organics to obtain super-hydrophobic properties.A single-electrode L-TENG driven by water droplets was constructed,and the feasibility of the TiO₂ nanotube hydrophobic coating as a friction layer was verified,and the output performance of L-TENG was improved.By driving the tubular single-electrode L-TENG with water flow,it is possible to directly capture the energy of liquid flow in the pipeline.The results show that the output performance of L-TENG increases with the increase of flow rate.When the length of the titanium tube is 6cm,the output performance of L-TENG is the best.This project has laid a certain theoretical and experimental foundation for the construction of the tube-type single-electrode L-TENG,and provided new ideas for the application and development of fluid velocity measurement and blockage detection in the pipeline.