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Triboelectric effect in energy harvesting

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Triboelectric effect in energy harvesting ( triboelectric-effect-energy-harvesting )

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17th World Textile Conference AUTEX 2017- Textiles - Shaping the Future IOP Publishing IOP Conf. Series: Materials Science and Engineerin1g23245546(72809107) 042021 doi:10.1088/1757-899X/254/4/042021 materials come into contact there is a charge transfer, one membrane becomes positively charged and the other negatively charged creating an electronic potential difference (EPD) with the presence of an air gap. The cause of electrostatic induction is still not well understood [12]. For this paper we concentrated on dielectric-dielectric sliding mode TEG’s fabricated from identical material, polyamide 6 (PA6) and polytetrafluoroethylene (PTFE) TEGs, with different contact areas. A series of experiments were completed for the following samples; sample 1 of dimensions 30x30mm, sample 2, 40x30mm, sample 3, 50x30mm and sample 4, 60x30mm with a vertical center force of 9.8N and at a speed of 0.02m/s. Although, previous research states the triboelectric phenomenon exists only when two different materials come into contact, the experiments identified a substantial EPD for two identical materials as proven by Apodaca et al. [13]. In addition, it was observed that the EPD occurs when the top component slides inwards, following the non contact phase. 2. Previous Research Previous research has demonstrated that although TEG’s produce a large voltage, they have a high internal resistance resulting in a low output current. [1]. Wang et al. [10] built a sliding mode triboelectric nanogenerator (TENG) of dimensions 71mm x 50mm using polyamide 6,6 and polytetrafluoroethylene (PTFE) films with surface etched nanowires on glass substrates. The TEG 2 producedanopencircuitvoltageupto∼1300Vandashortcircuitcurrentdensityof4.1mA/m witha peak power density of 5.3W/m2 which was used as a direct power supply to light up a series of LED’s. Yang et al. [14] developed a single electrode based sliding mode TENG using PTFE with surface- etched nanoparticles and an aluminium (Al) electrode. The TENG produced an open circuit voltage up to 1100V, a short-circuit current density of 6mA/m2, and a maximum power density of 350mW/m2 with a load of 100MΩ, which was used to drive 100 green-light-emitting diodes (LEDs). The working principle of the sliding mode is based on keeping one component steady and sliding the second component outward until there is no contact between the two components, then inward where the two components come into full contact and EPD is 0. Wang et al. [10] and Yang et al. [14] demonstrate the generation of the EPD when the top component of the TENG slides outwards, defining the larger the displacement between the two components, the greater the EPD. 3. Experimental section The dielectric-dielectric triboelectric devices consist of an upper and lower component. Each component constitutes of an acrylic substrate, an aluminum electrode and a PA6 and PTFE electrification layer. Lead wires connected the electrodes to the oscilloscope Agilent Technologies DSO3102A for measurements, refer to figure 1. The two components were vertically aligned with the bottom component stabilized and the top component unrestrained to slide in the lateral plane. Figure 1. Experimental set up. 2

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