Issue 14, 2022

Ultrahigh energy harvesting properties in temperature-insensitive eco-friendly high-performance KNN-based textured ceramics

Abstract

Mechanical energy-driven wireless charging technology has recently gained increasing attention. In this work, high-performance potassium sodium niobate (KNN)-based textured ceramics and their potential application in energy harvesting devices are systematically investigated. A series of lead-free 0.99K0.5Na0.5Nb(1−x)TaxO3–0.01Bi(Ni2/3Nb1/3)O3 [KNNTa–BNN] piezoceramics were designed and prepared to search for good comprehensive properties. The comprehensive performance of KNN-based piezoelectric ceramics has reached a new level in T–Ta-9 (d33 ∼ 435 pC N−1, kp ∼ 71%, Tc ∼ 360 °C) via the synergy of the textured structure (f(00l) > 94%) and multiphase coexistence (O–T) near room temperature. Based on the advanced in situ TEM and PFM analyses, it was found that the regular large-scale domains and corresponding poling patterns of the T–Ta-9 can be well maintained at relatively high temperatures (180–330 °C), resulting in excellent temperature stability. Hence, the d33 value of T–Ta-9 can be maintained above 300 pC N−1 over a wide range from room temperature to 300 °C, which rarely happens in the previously reported KNN-based materials. More importantly, the piezoelectric circular diaphragm (PCD) vibration energy harvester based on the T–Ta-9 texture ceramic possesses high output voltage (U ∼ 13 V) and output power (W ∼ 3 mW), and can still maintain above 60% after being heated at 200 °C for 30 min. This work represents a significant advancement in the lead-free piezoelectric energy-harvesting field (especially for high-temperature applications) and can provide guidelines for future efforts in this direction.

Graphical abstract: Ultrahigh energy harvesting properties in temperature-insensitive eco-friendly high-performance KNN-based textured ceramics

Supplementary files

Article information

Article type
Paper
Submitted
09 Jan 2022
Accepted
21 Feb 2022
First published
23 Feb 2022

J. Mater. Chem. A, 2022,10, 7978-7988

Ultrahigh energy harvesting properties in temperature-insensitive eco-friendly high-performance KNN-based textured ceramics

J. Lin, Y. Cao, K. Zhu, F. Yan, C. Shi, H. Bai, G. Ge, J. Yang, W. Yang, Y. shi, G. Li, H. Zeng and J. Zhai, J. Mater. Chem. A, 2022, 10, 7978 DOI: 10.1039/D2TA00203E

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