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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 on TENG which include different sources of energy harvesting in TENG, factors affecting the efficiency of TENG, different mechanism used in TENG and its applications in the real world. 2. Triboelectric Nanogenerator (TENG) 2.1 Different sources of energy harvesting 2.1.1 Wastewater flow energy harvesting method The wastewater flow energy of the flowing water can be efficiently harvested by a TENG in which Polytetrafluorethylene (PTFE) and Nylon 6.6 are used as the triboelectric materials. Energy is harvested by triboelectric effect and electrostatic induction effect, achieved by contact and sliding modes. The maximum output was achieved using four Nylon plates and one PTFE plate with a maximum discharge of 44 L/min. The device was efficiently able to light up 50 serially connected LEDs [1]. Figure 1. Schematic diagram of a rotatory TENG [1] Figure 1 shows the schematic diagram of a rotatory TENG. When water is allowed to flow through the tube, it forces the fan to rotate which is connected to the shaft. A triboelectric material is attached to the shaft, which rotates with the shaft due to the water flow. On the frame different triboelectric materials are placed at 8 different poles. When the shaft rotates the materials come in full contact and opposite tribocharges are generated on both the surfaces which results in the flow of current [1]. Jiang et al. designed a spring assisted TENG and investigated on harvesting energy from the water waves. Spring was used to store the potential energy of the water waves .The energy stored can again be used to produce energy via translating low frequency water wave motion energy into high frequency kinetic energy through the spring. The results showed that there should be a specific spring rigidity and specific spring length to be used to achieve highest efficiency [5]. Zhang et al. designed a TENG that can harvest the water wave energy. The authors introduced a dodecahedron (12 faced structure) enclosed device consisting of 12 sets of multi-layered wavy structured TENG, having a hard ball in the polyhedron. Each TENG consisted of Cu-Kapton-Cu film and two FEP films. The collision of ball with the TENG due to the kinetic energy of water produced electrical output [2]. Kim et al. developed a water driven TENG based on water electrification by using rotating fluid inertia. Observations showed that liquid-solid contact TENG is slightly affected by humidity and friction, and are capable of 2PDF Image | Critical Review on Triboelectric Nanogenerator
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