Abstract
Advanced high-temperature piezoceramic energy harvesters (HT-PEHs) highly rely on perovskite ceramics with large high-temperature piezoelectricity. However, it remains a great challenge to achieve high piezoelectric coefficient (d33) at elevated temperatures, which severely limits the development of piezoelectric materials in cutting-edge energy harvesting applications. Here, yBiScO3-xPbTiO3-0.05Pb(Zn1/3Nb2/3)O3 (yBS-xPT-PZN) ternary perovskite piezoceramics are prepared, in which the morphotropic phase boundary (MPB) composition (x/y = 0.60/0.35) exhibits a large d33 of 655 pC/N at 300 °C, outperforming many reported other perovskite piezoceramics. The excellent high-temperature piezoelectricity should benefit from the lattice softening effect and the stable ferroelectric domain state associated with the high tetragonal phase content. In addition, the HT-PEH assembled from the MPB sample exhibits good power generation performance (e.g., a giant power density of 418 μW/cm3) at 300 °C, and can charge a 10 μF commercial capacitor to 7 V within 40 s. Such a large piezoelectric coefficient and power density of yBS-xPT-PZN system at a high temperature of 300 °C is a promising candidate for fabricating high-performance HT-PEHs to meet the urgent requirements of advanced high-temperature energy harvesting applications.
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