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the self-charging capability of the power band (one capacitor connected) under hand clapping (the clapping frequency is estimated to be 5Hz) when no external load was connected. The overall charging curve can be divided into 5 regions: a-b, clapping; b-c: resting; c-d: clapping; d-e: resting; e-f: clapping. It takes roughly 30 mins to fully charge the supercapacitor when continuously clapping without large current leakage. Corresponding current response of the MSC charged at 5 Hz is shown in Figure 39d where stable current with small fluctuations can be observed at the charging regions. Other body movement such as walking or hand shaking may also be used to charge the nanogenerator. In applications such as wearable sensors where only few readings per day are needed for a few seconds, this energy harvesting rate may be sufficient. The flexible power band can be used as an ideal watch strap which powers the watch (four fully charged MSCs connected in series) at the same time, as shown in Figure 39e. It can also power up a thermos-humidity meter as in Figure 39f, which makes it suitable for both indoor and outdoor activities. Figure 39. Demonstration using self-charging power band. (a) Circuit diagram of the energy supply mode. (b) Charging Curve of the microsupercapacitor charged by TENG at various frequencies. (c) Charging curve showing the voltage increase of a single capacitor powered by TENG, corresponding current response is shown in (d). Digital photos showing 101PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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