基于多铁性复合薄膜的柔性压电-摩擦混合纳米发电机用于高效动能收集

The coupling between the electric and magnetic orders in polyvinylidene fluoride—iron (II, III) oxide (PVDF-Fe 3 O 4 ) nanocomposites offers a new pathway to enhance the output performance of existing PVDF-based nanogenerators. This enhancement is achieved through improved piezoelectric responsiveness, magnetostriction, and inherent flexibility, opening the door to the use of PVDF-based nanogenerators in self-powered electronic devices. This innovative magnetoelectric composite matrix was created by uniformly dispersing Fe 3 O 4 nanoparticles uniformly into the PVDF material. This process enhances the ferroelectric properties of PVDF through magnetoelectric coupling, all without the need for an external magnetic field. The resulting piezoelectric system was then integrated into a triboelectric nanogenerator, comprising Cu and polyethylene terephthalate (PET) with thin-film indium oxide electrodes serving as contact layers. The piezoelectric nanogenerator (PENG) device, based on PVDF-Fe 3 O 4 composite, produced an open-circuit voltage of 15 V, a short-circuit current of 0.6 mA/m 2 , and a power density of 0.12 mW/m 2 , respectively. Meanwhile, the developed triboelectric nanogenerator (TENG), with Cu-PET contact layers, delivered an electrical output of 125 V, 1.75 mA/m 2 , and a power density of 11 mW/m 2 . Upon integrating the PENG into the TENG structure, the resulting piezo-tribo hybrid system demonstrated a remarkable enhancement in electrical output, featuring an open-circuit voltage of 160 V, a short-circuit current of 3 mA/m 2 , and a power density of 20 mW/m 2 . This represents an approximately 80% increase compared to the pristine TENG. Importantly, this hybrid device has successfully powered electronic devices such as calculators and digital thermometers.