Abstract
Recently, piezoelectric and triboelectric energy harvesting devices have been developed to convert mechanical energy into electrical energy. Especially, it is well known that triboelectric nanogenerators have a simple structure and a high output voltage. However, whereas nanostructures improve the output of triboelectric generators, its fabrication process is still complicated and unfavorable in term of the large scale and long-time durability of the device. Here, we demonstrate a hybrid generator which does not use nanostructure but generates much higher output power by a small mechanical force and integrates piezoelectric generator into triboelectric generator, derived from the simultaneous use of piezoelectric and triboelectric mechanisms in one press-and-release cycle. This hybrid generator combines high piezoelectric output current and triboelectric output voltage, which produces peak output voltage of ~370 V, current density of ~12 μA·cm−2, and average power density of ~4.44 mW·cm−2. The output power successfully lit up 600 LED bulbs by the application of a 0.2 N mechanical force and it charged a 10 μF capacitor to 10 V in 25 s. Beyond energy harvesting, this work will provide new opportunities for developing a small, built-in power source in self-powered electronics such as mobile electronics.
Highlights
Piezoelectric and triboelectric energy harvesting devices have been developed to convert mechanical energy into electrical energy
We found that the 1 mF capacitor was charged by the hybrid generator to 20 V in 5 s under periodic pressing and releasing (5 Hz).the charging was 10 V in 25 s for the 10 mF capacitor and 5 V in 47 s for the 47 mF capacitor
To demonstrate the electrical output performance of the hybrid generator, we utilized commercial LED bulb arrays to be lit up, which were connected in series and in parallel on LED panels, by calculating the hybrid output voltage and current
Summary
Piezoelectric and triboelectric energy harvesting devices have been developed to convert mechanical energy into electrical energy. We demonstrate a hybrid generator which does not use nanostructure but generates much higher output power by a small mechanical force and integrates piezoelectric generator into triboelectric generator, derived from the simultaneous use of piezoelectric and triboelectric mechanisms in one press-and-release cycle. This hybrid generator combines high piezoelectric output current and triboelectric output voltage, which produces peak output voltage of ,370 V, current density of ,12 mA?cm[22], and average power density of ,4.44 mW?cm[22]. In order to address the above issues, we demonstrate a prototypical, piezoelectric/triboelectric hybrid generator that can produce high output power due to the cooperative operation of piezoelectric and triboelectric mechanisms in a single press-and-release cycle. The electrical energy output of the hybrid generator successfully lit up 600 light-emitting diode(LED) bulbs by a force of fingers (,0.2 N)
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