Triboelectric nanogenerators (TENGs) are attracting more and more attention since they can convert various mechanical energies into electric energy. However, in traditional TENGs for harvesting rotation energy, most of the contacts between two triboelectric materials are rigid-to-rigid contact with very large friction force, which limits their practical application. Here, we report an ultra-low-friction triboelectric–electromagnetic hybrid nanogenerator (NG). A freestanding mode TENG and a rotating electromagnetic generator (EMG) are integrated together to realize the complementary individual merits. The very soft and elastic contact between the two triboelectric materials in the TENG results into very small friction force. The influences of the type and the dimensions of the dielectric material on the performance of the TENG are studied systematically from theory to experiments. The results indicate that the open-circuit voltage and the transfer charge of the TENG increase with the rotation speed, which is very different from a traditional rotary TENG and is due to the increase of the contact area. The optimized TENG has a maximal load voltage of 65 V and maximal load power per unit mass of 438.9 mW/kg under a speed rotation of 1000 rpm, while the EMG has a maximal load voltage of 7 V and maximal load power density of 181 mW/kg. This demonstration shows that the hybrid NG can power a humidity/temperature sensor by converting wind energy into electric energy when the wind speed is 5.7 m/s. Meanwhile, it can be used as a self-powered wind speed sensor to detect wind speed as low as 3.5 m/s.

中文翻译：

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用于旋转能量收集和自供电风速传感器的超低摩擦摩擦电磁混合纳米发电机

摩擦电纳米发电机（TENGs）吸引了越来越多的关注，因为它们可以将各种机械能转化为电能。然而，在用于收集旋​​转能量的传统的TENG中，两种摩擦电材料之间的大多数接触是刚性到刚性的接触，具有很大的摩擦力，这限制了它们的实际应用。在这里，我们报告了一种超低摩擦的摩擦－电磁混合纳米发电机（NG）。独立式TENG和旋转电磁发电机（EMG）集成在一起，以实现互补的优点。TENG中两种摩擦材料之间的非常柔软和弹性的接触会产生很小的摩擦力。从理论到实验，系统地研究了介电材料的类型和尺寸对TENG性能的影响。结果表明，TENG的开路电压和转移电荷随转速的增加而增加，这与传统的旋转TENG有很大不同，这是由于接触面积的增加所致。优化的TENG在1000 rpm的转速下具有65 V的最大负载电压和438.9 mW / kg的每单位质量的最大负载功率，而EMG具有7 V的最大负载电压和181 mW的最大负载功率密度/公斤。该演示表明，当风速为5.7 m / s时，混合动力NG可以通过将风能转换为电能来为湿度/温度传感器提供动力。同时，