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Ultrahigh energy harvesting properties in textured lead-free piezoelectric composites

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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)O3/BaTiO3 (BCTS/BT) composites with highly [001]c-oriented and “core–shell” structured grains to resolve this challenge. Increasing texture degree F001 above 86% enabled rapid enhancements of piezoelectric charge/strain coefficients d33 and Image ID:c8ta10312g-t1.gif. Meanwhile, the inclusion of low-εr BT microcrystals inside the oriented BCTS grains effectively suppressed the dielectric permittivity εr of the composites, thus remarkably improving the piezoelectric voltage coefficient g33. Especially, the 98%-textured 0–3 composites demonstrated as high as ∼405% improvement in d33 × g33 value (17.0 × 10−12 m2 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.

Graphical abstract: Ultrahigh energy harvesting properties in textured lead-free piezoelectric composites

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Publication details

The article was received on 26 Oct 2018, accepted on 01 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10312G
Citation: J. Mater. Chem. A, 2019, Advance Article
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    Ultrahigh energy harvesting properties in textured lead-free piezoelectric composites

    Y. Sun, Y. Chang, J. Wu, Y. Liu, L. Jin, S. Zhang, B. Yang and W. Cao, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA10312G

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