Triboelectric nanogenerators have received significant research attention in recent years. The energy harvesting performance of triboelectric nanogenerator can be enhanced via more efficient structural and material designs. Here, we develop novel magnetic capsulate triboelectric nanogenerator (MC-TENG) devices to harvest electrical energy under various external excitations. MC-TENG uses a magnetic oscillation system to guide oscillating dielectric capsules within a conductive shield. Steel spring connectors are then utilized to maximize the oscillations and higher power density. Experimental studies is conducted to investigate the electrical performance of MC-TENG under cyclic loading. The output power of the developed nanogenerators reached 400 μW. The proposed MC-TENG concept provides an effective method to harvest electrical energy from low-frequency and low-amplitude oscillations.
In this study, we explore the postbuckling instability of piezoelectric-integrated cylinders under axial displacement for energy harvest applications. Experiments are conducted using 3D printed cylinders with piezoelectric transducers bonded on their outer and inner surfaces. The local and global postbuckling responses of the cylinders are triggered based on their design and geometry. Numerical simulations are carried out to study the effect of varying cylinder geometries on the harvested energy. A comparative study is performed between the numerical and experimental results. Furthermore, a corrugated design is proposed to tailor the postbuckling response of the cylinders from local buckling to global buckling. The results shows that the new corrugated designs for the cylinders improves the energy harvesting efficiency.