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.
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机译：近来，已经开发了压电和摩擦电能收集装置，以将机械能转换为电能。特别地，众所周知，摩擦电纳米发电机具有简单的结构和高的输出电压。然而，尽管纳米结构改善了摩擦发电器的输出，但是就装置的大规模和长期耐久性而言，其制造过程仍然是复杂且不利的。在这里，我们展示了一种混合发电机，该发电机不使用纳米结构，而是通过较小的机械力产生更高的输出功率，并将压电发电机集成到摩擦发电机中，这是通过在一个压力释放周期中同时使用压电和摩擦电机制而产生的。该混合发电机结合了高压电输出电流和摩擦电输出电压，产生的峰值输出电压约为370 V，电流密度约为12μA·cm −2 ，平均功率密度约为4.44 mW· cm −2 。通过施加0.2 N的机械力，输出功率成功点亮了600个LED灯泡，并在25µs内将10µF电容器充电至10µV。除了收集能量外，这项工作还将为开发自供电电子产品（如移动电子产品）中的小型内置电源提供新的机会。
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