Energy harvesting and wireless power transmission by a hybridized electromagnetic-triboelectric nanogenerator

Energy harvesting and power delivery are key technologies for self-powered systems towards mobile electronics, the internet of things and sensor networks. A critical issue is not only how to efficiently harvest environmental mechanical energy, but also how we can wirelessly transmit the harvested energy. Here, we have demonstrated a rotating-disk-based hybridized electromagnetic-triboelectric nanogenerator for simultaneously scavenging rotational energy and wirelessly transmitting energy using coils. Under a rotating rate of 900 rpm, the electromagnetic generator (EMG) and triboelectric nanogenerator (TENG) can produce output powers of about 137.39 mW (power density 180 mu W g(-1)) at a matched loading resistance of 300 omega and 217.8 mW (power density 1152 mu W g(-1)) at a matched loading resistance of 20 k omega, respectively. Moreover, the output current of the hybridized nanogenerator is increased to about 130 mA for wireless transmission. The power can be wirelessly transmitted up to a distance of similar to 60 cm in real time based on helical coils. LEDs can be lighted up. When a supercapacitor bank is applied for storing the generated electricity from the nanogenerator, the wireless transmitted power can charge a mobile phone located at 100 cm away from the transmitter by using a pair of customized helical wire coils. Furthermore, the received output of voltage can reach 153 V at a distance of 80 cm through a commercial voltage booster. The hybridized nanogenerator with wireless power transmission has potential applications in sustainably driving some self-powered and mobile electronic devices particularly for implantable medical devices and the internet of things.