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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regarded as the representative data of the output performance when the KTENG is stretched to these states. In the case that the device at the maximum applied strain is at the slightly or fully stretched state, the Voc and Qtr increase monotonically with the applied strain, while the Isc only changes sign at the maximum applied strain and the zero strain. In the case that the device at the maximum applied strain is at the over stretched state, the Voc and Qtr increase first with the applied strain until the strain of the fully stretched state is reached, after which both start to decrease until the maximum applied strain. In the process of recovering to the original zero-strain state, the Voc and Qtr increase again as the device approaches the fully stretched state and start to decrease thereafter. The behavior is clearly reflected by the concave top of the Voc and Qtr plots. Correspondingly, the Isc changes sign not only at the maximum applied strain and the zero strain but also at the strain of the fully stretched state, which results in the small humps at the middle of the Isc plot. The different behaviors of the electrical output when the KTENG is stretched to different states can be well explained by the working principles proposed in Figure 16. In the first two cases of slightly and fully stretched states, the charge separation distance increases monotonically with the applied strain, and thus the Voc and Qtr changes monotonically as well. In the case of over stretched state, the charge separation distance first increases with the applied strain but starts to decrease after the device reaches the fully stretched state, which results in a local maximum of the Voc at the strain of the fully stretched state and an additional position for the sign change of the Isc besides the maximum applied strain and the zero strain. Therefore, the Voc and Qtr will go through the trend of up-down-up-down in one stretch- release cycle as illustrated in Figure 17. It can also be observed that at the strain of the fully 49

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