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circuit diagram of the self-powered system, where the TENG and the supercapacitor are connected by a full-wave rectifier. The voltage of the supercapacitor is monitored by a voltmeter. When switch K1 is on and switch K2 is off, the voltage of the supercapacitor is increased by 21.49 mV after charged by the TENG in atmosphere for 10 s (Figure 7b), and the equivalent galvanostatic current (Ieg) can be calculated as 2.5 μA. When the same TENG works in high vacuum (P ~ 10-6 torr), the voltage of the supercapacitor is increased by 80.36 mV in the same time period (means 4.8 V in 10 minutes), delivering an Ieg of 9.6 μA, which is around 4 times of that in atmosphere. Thanks to the elevated output performance in high vacuum, when an electronic watch is connected as the load, the supercapacitor can still be charged with a charging current of 7.2 μA while the electronic watch is powered simultaneously (Figure 7c). The charging current drops to 0.61 μA when the TENG works in atmosphere (Figure 7d). When a commercial humidity-temperature meter with higher power consumption is used as the load, only working in high vacuum allows the TENG to power the device and charge the supercapacitor simultaneously and sustainably (Figure 7e). The meter continues to draw power from the supercapacitor when the TENG operates in air, as indicated by the monotone decrease of supercapacitor voltage in Figure 7f. Furthermore, a light-emitting diode (LED) light bulbs array (4 groups in parallel ×8 bulbs in series, rated power 0.75 W ×32) can be lit by the TENG working in high vacuum (Figure 7g), while the one in atmosphere can only support two bulbs at the same illuminance. This brief but straight-forward comparison demo shows the output power of this TENG is enhanced in 16-fold in high vacuum. 21PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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