Xi Kaibiao, Guo Jianzhe, Zheng Mupeng, Zhu Mankang, Hou Yudong
Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, People's Republic of China.
Nanomicro Lett. 2024 Nov 4;17(1):55. doi: 10.1007/s40820-024-01556-5.
High temperature piezoelectric energy harvester (HT-PEH) is an important solution to replace chemical battery to achieve independent power supply of HT wireless sensors. However, simultaneously excellent performances, including high figure of merit (FOM), insulation resistivity (ρ) and depolarization temperature (T) are indispensable but hard to achieve in lead-free piezoceramics, especially operating at 250 °C has not been reported before. Herein, well-balanced performances are achieved in BiFeO-BaTiO ceramics via innovative defect engineering with respect to delicate manganese doping. Due to the synergistic effect of enhancing electrostrictive coefficient by polarization configuration optimization, regulating iron ion oxidation state by high valence manganese ion and stabilizing domain orientation by defect dipole, comprehensive excellent electrical performances (T = 340 °C, ρ > 10 Ω cm and FOM = 4905 × 10 m N) are realized at the solid solubility limit of manganese ions. The HT-PEHs assembled using the rationally designed piezoceramic can allow for fast charging of commercial electrolytic capacitor at 250 °C with high energy conversion efficiency (η = 11.43%). These characteristics demonstrate that defect engineering tailored BF-BT can satisfy high-end HT-PEHs requirements, paving a new way in developing self-powered wireless sensors working in HT environments.
高温压电能量采集器（HT-PEH）是取代化学电池以实现高温无线传感器独立供电的重要解决方案。然而，同时具备优异的性能，包括高品质因数（FOM）、绝缘电阻率（ρ）和去极化温度（T）是不可或缺的，但在无铅压电陶瓷中却很难实现，尤其是在250°C下运行此前尚未见报道。在此，通过关于精细锰掺杂的创新缺陷工程，在BiFeO-BaTiO陶瓷中实现了性能的良好平衡。由于通过极化配置优化提高电致伸缩系数、通过高价锰离子调节铁离子氧化态以及通过缺陷偶极稳定畴取向的协同效应，在锰离子的固溶极限下实现了综合优异的电学性能（T = 340°C, ρ > 10Ω·cm且FOM = 4905×10mN）。使用合理设计的压电陶瓷组装的HT-PEH能够在250°C下以高能量转换效率（η = 11.43%）快速为商用电解电容器充电。这些特性表明，缺陷工程定制的BF-BT能够满足高端HT-PEH的要求，为开发在高温环境下工作的自供电无线传感器开辟了一条新途径。
