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Applications of the Gr-TENG with Al2O3 as the CTL as a power supply: (a) Photograph showing 20 green light-emitting diodes (LEDs) being powered. (b) Circuit diagram of the bridge-rectifier for charging a capacitor and turning on a timer. (c) Charging curves of capacitors with various capacitances (0.1, 1 and 2.2 µF). (d) Photograph of powering a timer.
