Magnetic Field Energy Harvesting with a Lead-Free Piezoelectric High Energy Conversion Material

Abstract

This article presents a high-performance lead-free piezoelectric energy harvester (LPEH) system for magnetic field. It based on a Ba0.85Ca0.15Ti0.90Zr0.10O3 + CuO 0.3 wt% (BCTZC(0.3)) composite was fabricated by sintering at 1450 degrees C. The BCTZC(0.3) composite, which has an enhanced high energy conversion constant (d33xg33), shows improved piezoelectric power-generation performance when compared with conventional piezoelectric energy harvesters. The BCTZC(0.3)-based LPEH produces instantaneous maximum power of 8.2 mW and an energy density of 107.9 mW/cm(3) in a weak magnetic field of 250 mu T. This system can be used to charge a capacitor and operate a wireless sensor network (WSN) system to provide temperature sensing and radio-frequency (RF) transmission in a 250 mu T magnetic field. The proposed LPEH is a promising green-energy device for potentially self-powering WSN systems when applied.