A Wireless Triboelectric Nanogenerator

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