He Xin, Xu Yiwei, Wu Jingen, Huang Heng, Liang Xianfeng, Du Yongjun, Qiao Jiacheng, Li Yang, Huang Hui, Ju Dengfeng, Hu Zhongqiang, Liu Ming
State Key Laboratory for Manufacturing Systems Engineering, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Engineering Research Center of Spin Quantum Sensor Chips, Universities of Shaanxi Province, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
School of Future Technology, and the National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology, Xi'an Jiaotong University, Xi'an, 710049, China.
Small. 2025 May;21(20):e2412214. doi: 10.1002/smll.202412214. Epub 2025 Apr 3.
Harvesting electrical energy from stray magnetic fields around the power cable is attractive in developing sustainable power sources for wireless sensor network. Magneto-mechano-electric (MME) generators, consisting of cantilevered magnetoelectric (ME) composite with permanent magnet mass, are promising for efficiently converting low-frequency stray magnetic fields into electrical energy. However, the power density needs further improvement for practical applications. Here, enhanced power density in MME generator is reported by optimizing the resonant frequency via structural optimization. This enhancement is ensured by manipulating the length ratio of the piezoelectric with regards to that of the magnetostrictive materials, as well as optimizing the total thickness of the ME composite, both of which are essential for matching the resonant frequency at 50 Hz. High output power density of 0.137 mW cm Oe under a small magnetic field of 0.5 Oe is achieved at 50 Hz in the MME generator. Meanwhile, the optimized MME generator can electrically power the multifunctional IoT sensors and wireless communication systems, by harvesting the uniform magnetic field as well as the stray magnetic field energy around the power cables of household appliances. The MME generator with high energy density shows great potential for the applications in self-powered wireless sensor network.
从电力电缆周围的杂散磁场中获取电能，对于开发无线传感器网络的可持续电源具有吸引力。磁机电（MME）发电机由带有永磁体质量块的悬臂式磁电（ME）复合材料组成，有望将低频杂散磁场高效转换为电能。然而，对于实际应用而言，其功率密度仍需进一步提高。在此，通过结构优化来优化共振频率，从而提高了MME发电机的功率密度。通过控制压电材料与磁致伸缩材料的长度比以及优化ME复合材料的总厚度来确保这种提高，这两者对于使共振频率匹配50Hz至关重要。在MME发电机中，在0.5Oe的小磁场下，50Hz时实现了0.137mW cm Oe的高输出功率密度。同时，优化后的MME发电机能够通过收集家用电器电源线周围的均匀磁场以及杂散磁场能量，为多功能物联网传感器和无线通信系统供电。具有高能量密度的MME发电机在自供电无线传感器网络应用中显示出巨大潜力。
