Recently, piezocomposite generating elements (PCGEs) have been proposed for improving the electricity generation
performance of piezoceramic wafers. The residual stress in the PZT layer after curing is one of the main reasons for
PCGE's enhanced performance, and the outer epoxy-based composites protect the brittle PZT layer. In this work, we
propose a d33-mode PCGE that can be used for energy harvesting. The piezoelectric coefficient d33 of the generating
element was used as a measure of the electricity generating performance. We fabricated several PCGEs and conducted
energy harvesting experiments to verify the concept of the d33-mode coefficient of generating element.