No abstract

No abstract

No abstract

No abstract

Over the past few years, triboelectric nanogenerators (TENGs) have emerged as promising devices for energy harvesting and self-powered sensing owing to their miniaturized structural design, lack of material limitation, high stability, and ecofriendly nature. In this study, the membrane consisting of poly(vinylidene fluorideco-hexafluoropropylene) (PVDF-HFP) and ionic liquid (PIL) is fabricated as triboelectric material, namely PIL membrane. To further improve the hydrophobicity of the membrane and the output performance of the TENG, different PIL membranes are prepared using various IL concentrations and their structures are modified using the evaporation phase inversion technique. The PIL membranes with nanoporous structures and strong hydrophobicity are synthesized by blade coating and bent to generate circular tube shapes for use in PIL-TENG cells. Therefore, the PIL-TENG has a high output performance owing to the availability of more ions through the establishment of an electrical double layer and an increase in electronegativity properties by doping with more fluoride atoms. Under optimal conditions, a nanoporous PIL-TENG of 10 wt.% ionic liquid exhibited the maximum peak-to-peak with an output voltage of 16.95 V and current of 2.56 μA. Especially, the instantaneous peak power density of the PIL-TENG reached the highest value of 26.1 mW/m 2 , which was 212% higher than that of the pristine PVDF-HFP TENG (P-TENG). In this manner, a new material for the triboelectric layer is presented to effectively improve the output performance, stability, and durability of TENGs, which are promising for use in practical applications related to harvesting hydrokinetic energy, self-powered sensors, and other applications.

Liquid-solid triboelectric nanogenerator (TENG) has received much attention as a promising electricity generation mechanism for renewable energy sources and self-powered electronic devices. Thus, enhancing TENG performance is a critical issue to be concerned for both practical and industrial applications.Hence, in this study, for the first time, the liquid-solid TENG based on functionalized graphene oxide (F-GO) and polyvinylidene fluoride (PVDF) composite membranes containing various F-GO concentrations were fabricated using the blade coating process. The surface of GO nanosheets was functionalized through covalent graft by using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FOTS). As indicated in FE-SEM images, the miscibility of the F-GO containing fluorine group in PVDF was effectively improved, which was created favorable conditions for PVDF crystallization and β phase configuration. Thus, the dielectric and polarization characteristics of the F-GO/PVDF membranes were greatly improved, eventuating in a rise in the output performance of F-GO/PVDF-based TENG. As a consequence, the F-GO/PVDF TENG generates 0.14 mW of output power from a single water droplet, which is 7 times more than PVDF TENG and 1.8 times higher than GO/PVDF TENG. It is proved the addition of functionalized GO nanosheets in PVDF is very effective for hydropower energy harvesting based on liquid-solid TENG.

Liquid-solid triboelectric nanogenerator (TENG) has been great attention as a promising electricity generation method for renewable energy sources and self-powered electronic devices. Thus, enhancing TENG performance is a critical issue to be concerned for both practical and industrial applications. Hence in this study, a high-output liquid-solid TENG is proposed using a polyvinylidene fluoride surface polarization enhancement (PSPE) for self-powered streamflow sensing, which shows many advantages, such as adapt to the sensor energy requirement, multiple parameters sensing at the same time, eliminate the influence of ion concentration. The TENG based on PSPE film has the maximum power density of 15.6 mW/m2, which is increased by about 4.7 times compared to commercial PVDF-based TENG. This could be attributed to the increase of the dielectric constant and hydrophobic property of the PVDF film after the surface polarization enhancement process. Furthermore, the PSPE-TENG-driven sensor can simultaneously monitor both the physical and chemical parameters of the streamflow with high sensitivity and minimum error detection, which proves that the PSPE-TENG has enormous potential applications in self-powered streamflow sensing.

No abstract