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growing severity of air pollution. Compared to conventional electrostatic precipitators, it can be self-powered and have no concern about ozone generation. The concept was first demonstrated using a wind-driven rotating TENG, whose rectified DC output was supplied to two parallel electrodes.67 Charged particles were then collected by the electrodes due to Coulombic forces of attraction and repulsion. Subsequently, a self-powered triboelectric filter consisting of vibratory PTFE pellets and electrode plates was developed to remove the particulate matter (PM) in automobile exhaust fumes using the self-vibration of the tailpipe, achieving a mass collection efficiency of ~95.5% for PM2.5 (Figure 50b).209 Recently, a washable multiplayer triboelectric air filter (TAF) consisting of nylon fabrics and PTFE fabrics was developed.68 Unlike commercial face masks, the removal efficiency was barely changed after the TAF was cleaned with commercial detergent, which makes it highly promising in fabricating a reusable and efficient face mask (Figure 50c). The HV of TENG can also be used for electrostatic actuation. Chen et al. demonstrated a TENG-driven actuation system based on dielectric elastomer actuators, which could modulate the on/off status of an intelligent switch or the spacing of tunable optical gratings.212, 213 With rationally designed electrodes on a chosen substrate, the voltage output of TENG provided the Coulomb force that modulated the motion of tiny objects such as water droplets and solid pellets.214 As in Figure 50d, a self-powered microfluidic transport system driven by TENG was developed based on the working mechanism.210 A mini vehicle consisting of four water droplets and an object-carrying pallet was placed on a hydrophobic surface, under which two lines of grating track Cu- electrodes were placed to guide the motion of the droplets. The track electrodes were connected periodically to the grid electrodes of a FS TENG, which consisted of a movable 135PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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