Abstract
Flexible piezoelectric nanogenerator (PENG) has attracted extensive attention due to the capability of energy collection and charging low-power microelectronic devices. Herein, PZT ceramic skeleton with three-dimensional (3D) interconnected network structure was fabricated via freeze casting technique. PZT/PDMS composites were prepared by introducing PDMS to the aligned pores of both green and sintered PZT skeletons. This special network structure enabled stress not to be buffered by PDMS. PENG composed of sintered PZT skeleton exhibited distinctly superior electrical output performance to that of the green one due to the effective stress transfer resulting from the direct contact between PZT particles. The maximum output voltage and output current of PENG based on 40 vol% sintered-PZT/PDMS composite reached 174 V and 28.2 μA, which were 19 V and 4.7 μA higher than those of green-PZT/PDMS composite, respectively. Thereby, this work provided a referable thought for the further development of PENG in the prospective market.
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