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International Conference on Mechanical, Materials and Renewable Energy IOP Publishing IOP Conf. Series: Materials Science and Enginee1ri2n3g4357678(920‘1’8“)” 012186 doi:10.1088/1757-899X/377/1/012186 connected LEDs. To maintain intimate surface of contact between the plates low stiffness springs were used [19]. 2.2.2 Sliding mechanism In the sliding mechanism, two different materials slide with respect to each other and electron transfer takes place between the materials. Yao et al. investigated about the electrostatic charge generation for the granules in the process of achieving equilibrium. The process of achieving equilibrium depends upon granule length ratio, sliding face shape, number of times the sliding occurs, the ratio of sliding area, relative sliding velocity, front facing edge and the sliding plate inclination angle. It was noted that semi-cylindrical granule generates more charge as compared to the rectangular granule [20]. A pendulum can be used to fabricate a TENG in which one triboelectric material is placed on the bob and another on the frame. When the bob is set into oscillations the materials slide with respect to each other and charge transfer takes place i.e. flow of current [15]. 2.3. Factor affecting the efficiency of TENG: 2.3.1 Impact of contact forces It was analysed that how the output efficiency of the TENG changes with respect to the change in the contact forces. When the contact force between the electrodes or the materials is less, a lesser area is in contact, hence less triboelectric charge density is produced. When the contact force is more, a larger area of contact takes place between the materials, the triboelectric charge density reaches to maximum and saturated, showing the hysteretic behaviour of the contact force response in TENG [21]. Figure 7. Response of the TENG to the pressure applied. [21] As shown in figure 7 when a small pressure is applied between the triboelectric materials, lesser charge density is produced due to less contact area while in the second case due to large pressure there is larger contact surface area resulting in more charge generation. Strain in a material can strongly affect the charge transfer between the triboelectric materials. Strain affects the physiochemical properties of the surface which affect the charge transfer [21]. In case of elastic materials when one surface of the material get in contact with the surface of other material strain is produced. Increasing the contact area increases the charge transfer. Greater forces during the contact resulted in the reverse of the direction of charge transfer and cause material strain [22]. 2.3.2 Effects of temperature and humidity The effect of humidity and pressure on the efficiency of the TENG can be optimised. The charge generation between the triboelectric materials increased by more than 20% when the relative humidity is decreased and when the atmospheric pressure decreases to 50 torr. High humidity is not efficient for triboelectric effect and is efficient at lower pressure [23]. A humidity resisting triboelectric generator 8PDF Image | Critical Review on Triboelectric Nanogenerator
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