Purusothaman Yuvasree, Leng Haoyang, Nanda Aman, Levine Ilan, Priya Shashank
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania16802, United States.
Department of Physics and Astronomy, Indiana University, South Bend, Indiana46615, United States.
ACS Appl Mater Interfaces. 2023 Feb 8;15(5):6584-6593. doi: 10.1021/acsami.2c15640. Epub 2023 Jan 24.
A lead-free (K,Na)NbO-based piezoelectric ceramic is textured along the (001) direction using the NaNbO (NN) seeds. The composition 0.96(KNa)(NbSb)O-0.01CaZrO-0.03(BiK)HfO (KNN) is found to provide an excellent combination of electromechanical coefficients at room temperature. The textured composition with 5 wt % NN template (KNN-5NN) exhibits considerably improved electromechanical coefficients, ∼ 590 pC/N, ∼ 0.46, and ∼ 215 ×10 C/N, at room temperature. A flexible piezoelectric energy harvester (F-PEH) is fabricated using the textured KNN-5NN ceramic and tested under cyclic force. F-PEH exhibits enhanced output voltage ( ∼ 25 V), current ( ∼ 0.4 μA), and power density ( ∼ 5.5 mW/m) ( of 10 MΩ) in the off-resonance frequency regime. In comparison to the random ceramic KNN-0NN-based F-PEH ( ∼ 8 V and ∼ 0.1 μA), the textured F-PEH significantly outperformed energy harvesting capability due to the large figure-of-merit value ( × ) ∼ 3354 ×10 m/J. This work provides a methodology for texturing lead-free materials and further implementing them in flexible energy harvesting devices and sensors.
一种无铅的(K,Na)NbO基压电陶瓷利用NaNbO(NN)籽晶沿(001)方向织构化。发现成分0.96(KNa)(NbSb)O-0.01CaZrO-0.03(BiK)HfO(KNN)在室温下能提供机电系数的优异组合。含有5 wt% NN模板的织构化成分(KNN-5NN)在室温下表现出显著提高的机电系数，约590 pC/N、约0.46和约215×10 C/N。使用织构化的KNN-5NN陶瓷制作了一种柔性压电能量采集器(F-PEH)，并在循环力作用下进行测试。F-PEH在非共振频率范围内表现出增强的输出电压(约25 V)、电流(约0.4 μA)和功率密度(约5.5 mW/m)(负载为10 MΩ)。与基于随机陶瓷KNN-0NN的F-PEH(约8 V和约0.1 μA)相比，织构化的F-PEH由于较大的品质因数(×)约3354×10 m/J而显著优于能量采集能力。这项工作提供了一种使无铅材料织构化并进一步将其应用于柔性能量采集装置和传感器的方法。
