HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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account of the actual work that can be achieved from a generator in a practical time interval. It is given by P =VIdt t (17) ave where V is the voltage across the applied load, I is the current flowing through it, and Δt is the length of selected time interval. Recently Zi et al. proposed a set of figure of merits for standardizing TENG72 as well as a rationally designed charging cycle using TENG,96 both of which emphasized the significance of voltage V and transferred charge Q, or the voltage- charge transfer (V-Q) plot, on the evaluation and maximization of TENG performance. Therefore, it makes sense to expressing the power equation using V and Q by substituting Idt with dQ, P =VdQt ave (18) According to both Equation 17 and 18, the length of time interval Δt is a very critical parameter that would greatly affect the validity of calculated average power as well as the amount of required computational efforts. If Δt is too short, the interval would not be adequate to give a reliable estimate of the long-term performance of the TENG; if it is too long, the process of experimental measurement and data analysis would be inefficient. The most straightforward choice of Δt is the period of the electrical output. However, as seen in Figure 10, the outputs of both SR-TENG and MA-TENG under ambient vibration are not periodic from cycle to cycle. Figure 12a and Figure 12b plot typical V-Q characteristics of SR-TENG under 3.5 Hz vibration and MA-TENG under 2.5 Hz vibration 37

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