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Demonstration of the E-TENG for energy harvesting. (a) Voltage real-time charge/discharge profile of a 22 μF capacitor connected to power management. (b) Charging-capability curves of the E-TENG under different capacitors (1–47 µF). (c) A photograph of the E-TENG-based self-charging system for driving an electronic watch. Reprinted with permission from [118]. Copyright 2023 Elsevier Ltd.
