Tang Gang, Wang Zhen, Hu Xin, Wu Shaojie, Xu Bin, Li Zhibiao, Yan Xiaoxiao, Xu Fang, Yuan Dandan, Li Peisheng, Shi Qiongfeng, Lee Chengkuo
Jiangxi Province Key Laboratory of Precision Drive & Control, Nanchang Institute of Technology, Nanchang 330099, China.
Department of Electrical & Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore.
Nanomaterials (Basel). 2022 Mar 31;12(7):1168. doi: 10.3390/nano12071168.
With the rapid development of wireless communication and micro-power technologies, smart wearable devices with various functionalities appear more and more in our daily lives. Nevertheless, they normally possess short battery life and need to be recharged with external power sources with a long charging time, which seriously affects the user experience. To help extend the battery life or even replace it, a non-resonant piezoelectric-electromagnetic-triboelectric hybrid energy harvester is presented to effectively harvest energy from low-frequency human motions. In the designed structure, a moving magnet is used to simultaneously excite the three integrated energy collection units (i.e., piezoelectric, electromagnetic, and triboelectric) with a synergistic effect, such that the overall output power and energy-harvesting efficiency of the hybrid device can be greatly improved under various excitations. The experimental results show that with a vibration frequency of 4 Hz and a displacement of 200 mm, the hybrid energy harvester obtains a maximum output power of 26.17 mW at 70 kΩ for one piezoelectric generator (PEG) unit, 87.1 mW at 500 Ω for one electromagnetic generator (EMG) unit, and 63 μW at 140 MΩ for one triboelectric nanogenerator (TENG) unit, respectively. Then, the generated outputs are adopted for capacitor charging, which reveals that the performance of the three-unit integration is remarkably stronger than that of individual units. Finally, the practical energy-harvesting experiments conducted on various body parts such as wrist, calf, hand, and waist indicate that the proposed hybrid energy harvester has promising application potential in constructing a self-powered wearable system as the sustainable power source.
随着无线通信和微功率技术的快速发展，具备各种功能的智能可穿戴设备越来越多地出现在我们的日常生活中。然而，它们通常电池续航时间短，需要使用外部电源充电且充电时间长，这严重影响了用户体验。为了帮助延长电池寿命甚至取代电池，本文提出了一种非谐振压电 - 电磁 - 摩擦电混合能量采集器，以有效地从低频人体运动中采集能量。在设计的结构中，一个移动磁体用于同时激发三个集成的能量采集单元（即压电、电磁和摩擦电），产生协同效应，从而在各种激励下可大幅提高混合设备的整体输出功率和能量采集效率。实验结果表明，在振动频率为4Hz、位移为200mm的情况下，对于一个压电发电机（PEG）单元，在70kΩ时混合能量采集器获得的最大输出功率为26.17mW；对于一个电磁发电机（EMG）单元，在500Ω时为87.1mW；对于一个摩擦纳米发电机（TENG）单元，在140MΩ时为63μW。然后，将产生的输出用于电容器充电，这表明三单元集成的性能明显优于单个单元。最后，在手腕、小腿、手部和腰部等身体各个部位进行的实际能量采集实验表明，所提出的混合能量采集器在构建自供电可穿戴系统作为可持续电源方面具有广阔的应用潜力。
