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in MA-TENG could easily reach the top base at the same frequency as the ambient one even without velocity amplification when the vibration frequency was above 5.0 Hz. In such a case, although the collision between m1 and m2 brings a larger count of contact between the triboelectric layers as shown in Figure 10, the major output contribution is attributed to the more intimate contact induced when the big masses m0 and m1 hit the top, as evidenced by the abrupt increase of output of both TENGs when the frequency changes from under 5.0 Hz to above 5.0 Hz. The maximum output power of both TENGs under different ambient vibration frequencies is summarized in Figure 13e, which clearly shows the enhanced performance of MA-TENG at low vibration frequency, with a maximum power ratio of 10:1 at 4.0 Hz. One point worth mentioning is that the structure of the TENGs, such as mass weight, springs, device height and etc., were not optimized in this work, and thus it is the relative comparison of their output power, rather than the absolute values, that is the focus of discussion. To further validate the results, the TENGs were used to charge a 0.33 mF capacitor at different vibration frequencies and the voltage increase of the capacitor after 30 s charging is plotted in Figure 13f. The comparison trend is highly consistent with that in Figure 13e, demonstrating the performance enhancement of MA- TENG in practical application. Considering that no other changes necessary in the device structure or operating mode, therefore, introducing a mechanical amplifier into TENG by splitting one single mass into two masses of large weight ratio is a simple but effective way to enhance its electrical output especially at low vibration frequencies. 40PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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