Effect of Surface Texture on the Output Performance of Lateral Sliding-Mode Triboelectric Nanogenerator

Abstract

In the working process of textured sliding-mode Triboelectric Nanogenerator (TENG), triboelectrification and wear occur simultaneously. At present, there is no systematic research on how the size of surface texture affects surface wear and output performance. In this paper, polymer surface with cylindrical texture of different pitches was prepared by photolithography and replication technology. According to the experimental results, the relationship between surface charge density and normal load of textured PI films was determined. Then the wear and electrostatic field of textured sliding-mode TENG were simulated by finite element method. The results show that the surface charge density increases with the contact load. And the open-circuit voltage of the sliding-mode TENG increases with the sliding distance given in this paper. The reason is that the height of textures in the separation zone is higher, which is caused by the shorter in-friction time and less wear, leading to the increased contact load in the next full-contact state. Therefore, more charges caused by the increased contact load tend to induce the higher output voltage. Moreover, textured surface with small pitch has better wear resistance and output characteristics. This research can provide an analytical method and basis for designing of surface texture in sliding-mode TENG.

From Body Monitoring to Biomolecular Sensing: Current Progress and Future Perspectives of Triboelectric Nanogenerators in Point-of-Care Diagnostics

“…Repeating this process enables TENGs to generate alternating current. Based on this, TENGs are categorized into four working modes ( Figure 2 ) [ 10 ]: vertical contact-separation mode [ 46 , 47 ], lateral sliding mode [ 48 , 49 ], single electrode mode [ 50 , 51 , 52 ], and freestanding triboelectric layer mode [ 53 , 54 ].…”

“…Repeating this pr enables TENGs to generate alternating current. Based on this, TENGs are categorized four working modes (Figure 2) [10]: vertical contact-separation mode [46,47], lateral ing mode [48,49], single electrode mode [50][51][52], and freestanding triboelectric layer m [53,54]. Vertical contact-separation (CS) mode: In this mode, when two objects with diff electronegativities are in vertical contact, electron exchange occurs at the contact sur As they separate, the equal but opposite charges between them induce a potential d ence across attached electrodes, generating an electric current when they are conne through wires.…”

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“…For the triboelectric effect, because different atomic nuclei have different binding capacities for extranuclear electrons, when two objects rub against each other, atoms with weak binding capacity for extranuclear electrons will lose electrons, while electrons with strong binding capacity for extranuclear electrons will gain electrons [ 22 ]. Currently, TENGs can operate under various working modes, for example, vertical contact separation mode [ 26 ], lateral sliding mode [ 27 ], single-electrode mode [ 28 ], and freestanding triboelectric layer mode [ 29 ] ( Figure 2 ). Among them, the vertical contact separation mode is the most basic one, where triboelectric layers are generally made of two different triboelectric materials and stacked side by side, and their respective backs are attached with current collectors.…”

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“…Upon repetition of the above process, the TENG will output alternating current [ 34 ]. On this basis, TENGs can be divided into four working modes ( Figure 2 ): vertical contact-separation mode [ 35 ], lateral sliding mode [ 36 ], single-electrode mode [ 37 ], and independent triboelectric layer mode [ 38 ].…”