Abstract
Here we demonstrate a magnetic resonance coupling based wireless triboelectric nanogenerator (TENG) and fully self-powered wireless sensors. By integrating a microswitch and an inductor with the TENG, the pulsed voltage output is converted into a sinusoidal voltage signal with a fixed frequency. This can be transmitted wirelessly from the transmit coil to the resonant-coupled receiver coil with an efficiency of 73% for a 5 cm distance between the two coils (10 cm diameter). Analytic models of the oscillating and coupled voltage signals for the wireless energy transfer are developed, showing excellent agreement with the experimental results. A TENG of 40 × 50 mm2 can wirelessly light up 70 LEDs or charge up a 15 μF capacitor to 12.5 V in ~90 s. The system is further utilized for two types of fully self-powered wireless chipless sensors with no microelectronic components. The technologies demonstrate an innovative strategy for a wireless ‘green’ power source and sensing.
Highlights
We demonstrate a magnetic resonance coupling based wireless triboelectric nanogenerator (TENG) and fully self-powered wireless sensors
“Green” energy harvesting technologies have attracted great attention owing to their significant potential in tackling the crises of energy shortage and climate change by providing sustainable energy for the rapidly increasing number of personal electronic devices, sensors, and other components that comprise the Internet of Things (IoT), wearable/ portable electronics[1,2,3,4]
A contact-separation mode TENG was used in this work, though other modes of TENGs36,37 are suitable for the proposed MR-WTENG
Summary
We demonstrate a magnetic resonance coupling based wireless triboelectric nanogenerator (TENG) and fully self-powered wireless sensors. By integrating a microswitch and an inductor with the TENG, the pulsed voltage output is converted into a sinusoidal voltage signal with a fixed frequency This can be transmitted wirelessly from the transmit coil to the resonant-coupled receiver coil with an efficiency of 73% for a 5 cm distance between the two coils (10 cm diameter). By integrating an inductor coil with a capacitive-type TENG and a synchronized microswitch, the pulsed voltage output of the TENG is converted into a sinusoidal voltage with a fixed resonant frequency These a.c. signals are transmitted out wirelessly through a primary inductor coil and are received by a secondary inductor coil at a distance. The system is directly utilized for fully self-powered wireless sensing up to a distance of 2 m
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