High-Performance Liquid-Solid Triboelectric Nanogenerator Based on Polyvinylidene Fluoride and Magnetic Nanoparticle Composites Film

Abstract

Magnetorheological compounds, which are created by distributed magnetic particles in viscoelastic environments and employed as materials for energy collecting and conversion, significantly enhance wearable and skin-mountable electrical devices. Considering the anisotropic properties through the magnetic fields have a significant impact on the surface polarization of the material, it is critical to examine the role of the magnetorheological compound as a triboelectric layer in triboelectric nanogenerator (TENG) output performance. Here, polyvinylidene fluoride (PVDF) and ferromagnetic cobalt ferrite $(\mathbf{CoFe_{2}O_{4}})$ nanoparticles were used to fabricate a magnetic polymeric composite (MPC) film as a triboelectric layer to enhance the output performance of TENG. The polar crystalline phase content of PVDF was considerably enhanced with the addition of $\mathbf{CoFe_{2}O_{4}}$ nanoparticles, going from 51.2 % with pristine PVDF to 77.7% with 5 wt. % $(\mathbf{CoFe_{2}O_{4}})$ in MPC, demonstrating a rise in negative charge and dielectric constant of the MPC film. Therefore, the output performance of the MPC5-TENG was shown a significant increase with a peak current of $2.27\mu\mathbf{A}$” a peak voltage of 17.2 V, and power density up to 90 mW/m2, giving 2.4 times higher than pristine PVDF - TENG. Finally, with exceptional stability and durability, we anticipate that this MPC- TEN G will bring additional views on hydrokinetic energy harvesting in the future