首页|Defect Engineering with Rational Dopants Modulation for High-Temperature Energy Harvesting in Lead-Free Piezoceramics
Defect Engineering with Rational Dopants Modulation for High-Temperature Energy Harvesting in Lead-Free Piezoceramics
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Defect Engineering with Rational Dopants Modulation for High-Temperature Energy Harvesting in Lead-Free Piezoceramics
High temperature piezoelectric energy harvester(HT-PEH)is an important solution to replace chemical battery to achieve independent power supply of HT wireless sensors.However,simultane-ously excellent performances,including high figure of merit(FOM),insulation resistivity(ρ)and depolarization temperature(Td)are indis-pensable but hard to achieve in lead-free piezoceramics,especially oper-ating at 250℃ has not been reported before.Herein,well-balanced performances are achieved in BiFeO3-BaTiO3 ceramics via innovative defect engineering with respect to delicate manganese doping.Due to the synergistic effect of enhancing electrostrictive coefficient by polariza-tion configuration optimization,regulating iron ion oxidation state by high valence manganese ion and stabilizing domain orientation by defect dipole,comprehensive excellent electrical performances(Td=340℃,P250 ℃＞107 Ω cm and FOM250 ℃=4905×10-15 m2 N-1)are realized at the solid solubility limit of manganese ions.The HT-PEHs assembled using the rationally designed piezoceramic can allow for fast charging of commercial electrolytic capacitor at 250℃ with high energy conversion efficiency(η=11.43％).These characteristics demonstrate that defect engineering tailored BF-BT can satisfy high-end HT-PEHs requirements,paving a new way in developing self-powered wireless sensors working in HT environments.
Lead-free piezoceramicDefect engineeringDopants modulationHigh-temperaturePiezoelectric energy harvester
Key Laboratory of Advanced Functional Materials,Ministry of Education,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,People's Republic of China
Lead-free piezoceramic Defect engineering Dopants modulation High-temperature Piezoelectric energy harvester
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