Abstract
Piezoelectric energy harvesting is a hot topic in the field of new energy, and the key point is to design high power lead-free piezoelectric ceramic. In this work, a novel lead–free material system of (1–x)Ba(Zr0.1985Cu0.0015Ti0.8)O3-δ–x(Ba0.7Ca0.3)TiO3 [(1–x)BZCT–xBCT] was designed, and the energy harvesting characteristics were tailored through the composition-driven phase boundary evolution. The R–O–T phase boundary boosts the strong piezoelectric activity, obtaining an optimal energy harvesting performance. In the mode of the cantilever-type energy harvester, a high output power of 70μW and voltage of 8V were obtained at x=0.55 specimen with a low resonance frequency of 90Hz and acceleration of 10m/s2, which were further increased to 700μW and 25V when the acceleration increased to 50m/s2. The excellent low frequency characteristics show the potential applications of this material in piezoelectric generators harvesting environmental vibration energy.
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