Evaluation of the performance of a lead-free piezoelectric material for energy harvesting

摘要

Vibration-based energy harvesting has been explored as an auxiliary power source, which can provide small amounts of energy to power remote sensors installed in inaccessible locations. This paper presents an experimental and analytical study of an energy harvesting device using a lead-free piezoelectric material based on MoO3-doped (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O-3 KNL-(NTS)Mo. The harvesting model corresponds to a cantilever beam with a KNL-(NTS) Mo piezoelectric disc attached to it. We analyze the effect of electromechanical coupling and load resistance on the generated electrical power. Electromechanical frequency response functions that relate the voltage output to the translational base acceleration are shown for experimental and analytical results.