Enhanced flexible piezoelectric generating performance via high energy composite for wireless sensor network.

Piezoelectric 0.72 Pb(Zr 0.47 Ti 0.53 )O 3 -0.28 Pb[(Zn 0.45 Ni 0.55 ) 1/3 Nb 2/3 ]O 3 + 0.5 mol% CuO (PNNC) particles were made for use in a composite of flexible energy harvester (FEH) that can convert sustainable mechanical deformation into electrical energy. The PNNC particles with a high transduction coefficient ( d 33  ×  g 33 ) were mixed with polydimethylsiloxane (PDMS) matrix to produce the FEH. The FEH generated maximum output voltage of 55.24 V and current density of 2.76 μA/cm 2 (power density: 554 μW/cm 3 , 3.2 mW) at the resonance frequency of 11 Hz. The energy conversion efficiency of about 20.7% has been achieved. The developed energy harvester is demonstrated in the self-powered wireless sensor node application in which the FEH spontaneously generated stable power under continuous mechanical stress. [ABSTRACT FROM AUTHOR]