期刊
NANO ENERGY
卷 84, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105900
关键词
Potassium sodium niobate; Lead-free ceramics; Phase structure; Acoustic energy harvesting; Piezoelectric composite; Implantable device
类别
资金
- National Natural Science Foundation of China [12004267, 52032007]
- Fundamental Research Funds for the Central Universities of China, Sichuan Science and Technology Program [2019YJ0096]
- Postdoctoral Science Foundation of Sichuan University [20826041D4002]
This study introduces KNN-based ceramics and their application in energy harvesting devices, designs a series of lead-free piezoelectric ceramics for good performance, and successfully manufactures a high-output flexible ultrasound-based wireless energy harvesting device. Experimental results demonstrate the potential of KNN-based materials in biomedical applications.
Ultrasonic driven wireless charging technology has recently gained increasing attention. High-performance potassium sodium niobate [(K, Na)NbO3, KNN] based ceramics and its potential application on energy harvesting device are presented in this work. A series of lead-free (0.964()K0.48Na0.52)Nb(0.96)Sb0.04O(3)-0.032(Bi0.5Na0.5) ZrO3-xBiFe(0.9)Co0.1O(3) [KNNS-BNZ-xBFC] piezo-ceramics are first designed and prepared to search for good piezoelectric properties, high Curie temperature and good thermal stability. Through content tailoring, the KNNS-BNZ-0.004BFC ceramic presents enhanced piezoelectric properties via the construction of rhombohedraltetragonal phase boundary near room temperature. Based on the synthesized ceramics, a high-output flexible ultrasound-based wireless energy harvesting device is further designed and manufactured to establish a connection among ceramics and practical application in lead-free KNN-based ceramics. The average ultrasound receiving sensitivity of the fabricated device is calculated to be similar to 1.5 Vpp center dot MPa 1, demonstrating the superior performances. An instantaneous power density of 52.07 mW/cm2 has been obtained from the incident ultrasound pressure of 1.90 MPa. Capacitor charging applications and the feasibility study of ex vivo characterizations under porcine tissue also demonstrate the good application prospect of the harvester. The above results exhibit great potential of the environmentally friendly KNN-based materials to be integrated in the implantable device for safe biomedical applications.
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