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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 Figure 4. Portable self-retracting TENG, (a) schematic representation of PSR-TENG, (b) schematic representation of extraction process of the dielectric sheet, (c) schematic representation of stacking and fluttering processes. [13] 2.1.6 TENG from a comb shaped electrode and a pendulum A simple design and highly accessible TENG can be fabricated by using a comb-shaped electrode. Its working mechanism is on contact electrification and electrostatic induction effect for harvesting energy. The larger the number of comb electrode arms used, larger will be the energy produced. Rough surfaces produce more energy as compared to flat surfaces [14]. By using the oscillations of a pendulum a TENG can be prepared, When the force is applied on the pendulum, the gravity force helps the pendulum to sustain to and fro motion, producing multiple outputs for a single input. Four setups were prepared among which materials having micro roughness and nanowires showed the maximum efficiency. With the increase in surface roughness, the efficiency increased due to the increased contact area. [15] Figure 5. Schematic diagram of TENG and the pendulum of the clock, having two parts (I and II) among which I movable and II fixed. When I and II come in contact charge generation takes place, hence electricity. [15] In figure 5 shown above, one material is placed on the frame and another material is attached with the bob of the pendulum. When the pendulum is set into oscillations, both the materials come in contact and charge transfer takes place due to the unbalancing of the charges that leads to the flow of current [15]. 2.2. Performance on the basis of the type of contact: 2.2.1 Contact-separation mechanism A vertically stacked TENG consisting of two outer electrodes and a vibrating membrane between them was fabricated for harvesting the bi-directional wind energy. To prevent sticking of the electrodes due to vibrations a pyramid microstructure was engraved on the electrodes. It enhanced the contact area and resulted in more charge density. The output power increased proportionally with the number of stacking layers [16]. Elastic bellows can be utilized as a packaging part and elastic component in the fabrication of a TENG. The bellows are elastic in nature when pressed they naturally attain their original shape after the removal of the force. The device works on the vertical contact-separation 6PDF Image | Critical Review on Triboelectric Nanogenerator
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