High-power piezoelectric energy harvester produced using [0 0 1]-textured (Na, K)NbO3-based lead-free piezoceramics

Sun Woo Kim, Seok June Chae, Dae Su Kim, Jong Un Woo, Eun Ji Kim, Su Hwan Go, Jae Min Eum, Hyung Won Kang, Seung Ho Han, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

Abstract

High-power piezoelectric energy harvesters (PEHs) require piezoceramics with a large kp and d33 but small εT330 values. The [0 0 1]-textured 0.96(Na, K)(Nb1−xSbx)–0.04SrZrO3 piezoceramics (x = 0.025 and 0.045) exhibited the improved electromechanical coupling factor (kp) and piezoelectric charge constant (d33); however, the increase of dielectric constant (εT330) was not significant. Further, the textured piezoceramic with x = 0.045 shows the large d33 × g33 value of 21.5 pm2/N, where g33 is piezoelectric voltage constant, indicating that texturing is a good technique to fabricate the piezoceramics for PEH. The impedance curve of the PEH consisting of the metal substrate and textured piezoceramic shows a piezoelectric resonance peak at a low frequency, which is the same as the mechanical resonance frequency of the PEH. Hence, the PEH can be considered a piezoelectric material. The figure of merit of the PEH was determined using the mechanical quality and electromechanical coupling factor calculated from the impedance curve of the PEH. A large power output of 1.7 mW was obtained from the type-1 PEH at the resonance frequency produced using the textured thick film (x = 0.045). Hence, this PEH can be used as a permanent power source for microelectronic devices in the Internet of Things.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • energy harvesting
  • figure of merit
  • lead-free ceramics
  • piezoelectric materials/properties
  • texture

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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