Ultrahigh energy harvesting properties in textured lead-free piezoelectric composites

Yuan Sun, Yunfei Chang, Jie Wu, Yingchun Liu, Li Jin, Shantao Zhang, Bin Yang, Wenwu Cao

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Piezoelectric energy harvesters have gained significant attention in recent years due to the strong demand of sustainable power sources for wireless sensor networks and portable/wearable electronics. However, the relatively low figure of merit (d × g) induced by thermodynamic constraints seriously hinders the enhancement of power generation capability in lead-free piezoelectrics. In this work, crystallographic texture and composite design strategies were integrated to develop novel 0-3 type (Ba, Ca)(Ti, Sn)O 3 /BaTiO 3 (BCTS/BT) composites with highly [001] c -oriented and "core-shell" structured grains to resolve this challenge. Increasing texture degree F 001 above 86% enabled rapid enhancements of piezoelectric charge/strain coefficients d 33 and . Meanwhile, the inclusion of low-ϵ r BT microcrystals inside the oriented BCTS grains effectively suppressed the dielectric permittivity ϵ r of the composites, thus remarkably improving the piezoelectric voltage coefficient g 33 . Especially, the 98%-textured 0-3 composites demonstrated as high as ∼405% improvement in d 33 × g 33 value (17.0 × 10 -12 m 2 N -1 ), attributed to the strong piezoelectric anisotropy, the formation of much finer domains and the elastoelectric composite effect. The cantilever energy harvesters based on such composites possessed ∼560% enhancement in power density (4.5 μW mm -3 ) at 1 g acceleration relative to the non-textured counterpart, which significantly outperformed many previously reported lead-free piezoelectrics. This work provides a new important paradigm for developing high-performance viable green energy harvesters, which can largely expand the application fields of lead-free piezoelectrics.

Original languageEnglish (US)
Pages (from-to)3603-3611
Number of pages9
JournalJournal of Materials Chemistry A
Volume7
Issue number8
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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