Electrification Mechanism and Influence Factors of Sliding Triboelectric Nanogenerators Based on Micro-Contact Model

As a new green energy-harvesting technology, the electrification mechanism and output performance of triboelectric nanogenerators (TENGs) have become the research focuses and difficulties. Based on the basic principles of contact and damage mechanics, a five-stage micro-contact model is proposed on the interface of sliding TENGs friction subsurface. Experimental bench is built to complete the experimental validation and factors affecting the output performance of TENGs are experimentally investigated. In the results, it is shown that the contact form of the asperities on the surface of the friction subsurface determines the real contact area and the form of energy conversion, and the dynamical processes between the asperities are influenced by the velocity, load, and material, which further affect the elastic/plastic change of the friction surface and the directional transfer of contact electrons. Normal loading promotes the density and efficiency of electron transfer between the interfaces of the friction sub-interfaces, but the electrical output performance of the system is no longer enhanced when the load is too high (>= 10 N). The faster sliding speed is conducive to improving the output performance of the horizontal sliding TENG in a certain range (0.005-0.100 m s-1). Herein, a five-stage micro-contact model is proposed on the interface of sliding triboelectric nanogenerators friction subsurface. The contact form of the asperities determines the real contact area and the form of energy conversion, and the dynamical processes between the asperities are influenced by the velocity, load, and material, which further affect the directional transfer of contact electrons.image (c) 2024 WILEY-VCH GmbH