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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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charge separation will induce potential difference between the electrode and the ground in the open-circuit condition, and electrons will be driven from the ground to the electrode in the short-circuit condition. As the tensile strain increases and the angular deflection of the rectangular cuts of FEP film reaches approximately 90o, the largest distance between the triboelectric layers as well as the maximum open-circuit potential difference will be achieved, which is defined as the fully stretched state. As the tensile strain continues to increase, the KTENG will transit to over-stretched state. The distance between the triboelectric layers and the open-circuit potential difference will start to decrease, and the electrons will flow from the electrode to the ground in the short-circuit condition until the stretching stops. When the tensile force is released and the device recovers to its original state, the distance between the triboelectric layers will increase first until back to the fully stretched state and decrease afterwards until back to the initial state, so is the open-circuit potential difference between the electrode and the ground. In the short-circuit condition, the electrons will first flow from the ground to the electrode before reverting back to the fully stretched state and vice versa afterwards. Therefore, a cyclic AC output can be generated across the load between the electrode and the ground when a periodic tensile force is applied on the KTENG. In case the maximum strain is not large enough, the entire power generation cycle may be partially fulfilled, as illustrated by the dark blue and purple dash lines in Figure 16. The rationally designed interlocking kirigami structure poses restraints on the deformation of FEP film and ensures that the device can recover to its original state when the tensile force is released, which greatly enhances the robustness and reliability of the device. Furthermore, unlike conventional TENGs which require additional spacers for the charge separation process, the KTENG relies on the deformation of different 47

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