Comparison of K0.5Na0.5NbO3and PbZr0.52Ti0.48O3compliant-mechanism-design energy harvesters

Veronika Kovacova, Jung In Yang, Leonard Jacques, Hong Goo Yeo, Valentin Lanari, Christopher Rahn, Susan Trolier-Mckinstry

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Abstract

Piezoelectric energy harvesting from ambient vibrations offers an environmentally friendly approach to powering distributed sensors for the Internet of Things. This paper gives a direct comparison of Pb(Zr,Ti)O3 (PZT)- and (K,Na)NbO3 (KNN)-based harvesters using a compliant mechanism harvester design for resonant frequencies of 20, 40, and 70 Hz. At 70 Hz, the measured power densities for PZT- and KNN-based devices are 1139 and 31 μW/mm3, respectively, for unimorph structures on nickel foils of 25 and 50 μm in thickness. The power density ratios scale proportionally to the material energy harvesting figures of merit. Energy harvesting with the compliant mechanism design is twice as efficient when compared to harvesting with a simple cantilever beam.

Original languageEnglish (US)
Article number1141011
JournalJournal of Applied Physics
Volume129
Issue number11
DOIs
StatePublished - Mar 21 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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