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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 401-408.
doi: https://doi.org/10.1007/s43207-020-00038-9
(K,Na)NbO3‑LiNbO3 nanocube‑based flexible and lead‑free piezoelectric nanocomposite energy harvesters
Hyunseung Kim1, Changwan Sohn1, Geon‑Tae Hwang2, Kwi‑Il Park3, Chang Kyu Jeong1,4
1Division of Advanced Materials Engineering, Department of Energy Storage/Conversion Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
2Functional Ceramics Department, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 51508, Republic of Korea
3School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
4Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
Correspondence  Kwi‑Il Park ,Email: kipark@knu.ac.kr
Chang Kyu Jeong ,Email: ckyu@jbnu.ac.kr
Received: January 28, 2020; Revised: March 3, 2020   Accepted: March 17, 2020.  Published online: April 30, 2020.
ABSTRACT
The research on harvesting the wasted mechanical energy and using it as a useful energy source has been in the spotlight. Conventional ceramic-based devices have disadvantages such as mechanical brittleness and high-temperature processing. To overcome these weaknesses, the piezoceramic materials mixed with polymer matrix have been studied to produce flexible piezoelectric devices. Herein, a piezoelectric composite film is fabricated by mixing lead-free 0.942[Na0.535 K0.480NbO3]- 0.058LiNbO3 (KNNLN) nanocube powder with polydimethylsiloxane (PDMS) matrix. KNNLN nanocube powder is synthesized by a solid-state reaction method, which can typically present outstanding stoichiometric composition and perovskite crystalline structure. The cube-shaped particles are thought to show higher stress concentration at corners and edges of the nanocube than spherical particles when external mechanical input is applied. The flexible KNNLN nanocube– PDMS nanocomposite device generates the piezoelectric signals of ~ 28 V and ~ 220 nA during bending motion, which is a high-performance energy harvesting efficiency compared to previous KNN-based flexible piezoelectric composites generators. KNNLN nanocube-based composite can replace toxic lead-based nanocomposites for future flexible devices such as eco-friendly self-powered energy harvester and biocompatible sensor.
Key words: Lead-free · Nanocube · Piezoelectric · Energy harvesting · Flexible device
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