A PMNN-PZT Piezoceramic Based Magneto-Mechano-Electric Coupled Energy Harvester

It is desired to obtain a piezoceramic with a high piezoelectric coefficient and low dielectric loss simultaneously for energy harvester application. Herein, it is reported that the 0.025Pb(Mn1/3Nb2/3)O-3-0.525Pb(Ni1/3Nb2/3)O-3-0.135PbZrO(3)-0.315PbTiO(3) (PMNN-PZT) ceramic exhibits superior piezoelectric charge parameter e(33) of 37.74 pC m(-2) and low dielectric loss tan delta of 0.45%. Furthermore, a PMNN-PZT ceramic-based magneto-mechano-electric coupled energy harvester (MMEC-EH) with a varying-stiffness cantilever is designed and fabricated, which shows the strong self-resonance effect in response to a random, transient impulse vibration or magnetic field stimulus. The investigations show that under a 0.6 s pulse vibration stimulus, the MMEC-EH can tune itself into self-resonance damping oscillation lasting for six seconds at its resonance frequency of 16 Hz, and the produced maximum power is 1.96 mW(RMS). Under both weak magnetic field and force-field dual-stimulus (H-ac = 0.5 Oe and a = 0.05 g), the generated power density is about 60 mW(RMS) Oe(-2)g(-2)cm(-3), which is one to two orders of magnitude higher than those previously reported MMEC-EHs. Finally, the MMEC-EH is successfully demonstrated to power temperature/humidity sensors, indicating its potential for harvesting both weak vibration and magnetic field energy from environments for self-powered sensor application.