We demonstrate a new paradigm for the wireless harvesting of mechanicalenergy via a 3D-printed triboelectric nanogenerator (TENG) which comprises agraphene polylactic acid (gPLA) nanocomposite and Teflon. The synergisticcombination of eco-friendly PLA with graphene in our TENG exhibited an outputvoltage > 2 kV with an instantaneous peak power of 70 mW, which in turngenerated a strong electric field to enable the wireless transmission ofharvested energy over a distance of 3 m. Specifically, we demonstrate wirelessand secure actuatation of smart-home applications such as smart tint windows,temperature sensors, liquid crystal displays, and security alarms either with asingle or a specific user-defined passcode of mechanical pulses (e.g.,Fibonacci sequence). Notably, such high electric output of a gPLA-based TENGenabled unprecedented wireless transmission of harvested mechanical energy intoa capacitor, thus obviating the need for additional electronics or energysources. The scalable additive manufacturing approach for gPLA-based TENGs,along with their high electrical output can revolutionize the present method ofharnessing the mechanical energy available in our environment.
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