طراحي، ساخت و ارزيابي خواص نانوژنراتور تريبوالكتريك بر پايه Mxene

The fabricated EW-TENG performed the electrophoretic deposition of ZnO nanoparticles on copper layers without microcracks in the coating. COMSOL Multiphysics software was used to simulate the potential distribution of the fabricated nanogenerator. The durability an‎d stability of the layer prepared from egg white was poor, after 5000 cycles of use, the coating cracked. Therefore, in the second part, agricultural wastes (corn husks an‎d coconut coir fibers) were used to make positive friction layers. The durability an‎d stability of the layers prepared from corn husks an‎d coconut fibers were recorded for more than 7200 usage cycles without voltage dro‎p. The second phase includes the construction an‎d eva‎luation of the negative friction layer of the nanogenerator based on two-dimensional nanostructures. In this section, two-dimensional graphitic carbon nitride (gC3N4) nanosheets were synthesized by pyrolysis of urea. Scanning electron microscope images (SEM), Fourier transform infrared spectroscopy (FTIR), an‎d X-ray diffraction (XRD) have been used to characterize the structure. Then, two environmentally friendly an‎d photosensitive triboelectric nanogenerators based on 2D gC3N4 were introduced as negative layers, corn husks an‎d coconut fibers as positive layers. Nanogenerators made of corn husks an‎d coconut fibers with dimensions of 2*2 cm2 produced a maximum output power of 33 mW/cm2 an‎d 495 mW/cm2, respectively. The performance of these two TENGs was investigated by connecting them to commercial blue LED an‎d also under UV light. An approximately 1.5-fold increase in the output voltage of both TENGs was observed under UV light, which is due to the absorption of UV light by gC3N4 nanosheets an‎d indicates the capability of this nanogenerator as an optical sensor. Next, two-dimensional Mxene nanosheets were synthesized by etching Ti3AlC2 precursor. UV-vis spectroscopic analysis, SEM, an‎d XRD were used to characterize the structure. Then, a TENG with dimensions of 2*2 cm2 was made based on polyvinyl chloride/maxine composite (negative layer) an‎d polyvinyl alcohol/coconut fiber biocomposite (15% by weight) (positive layer). The maximum open circuit voltage an‎d short circuit current for this nanogenerator were 1200 V an‎d 13 mA, respectively. The maximum output power was 1178.5 mW/cm2. The results of investigating the performance of this nanogenerator as an optical sensor showed an increase of approximately 1.3 times in the output results under UV light with a wavelength of 390 nm, which indicates the excitation of maxin nanoplates in the nanogenerator under ultraviolet light. The power conversion efficiency of 27.15 an‎d the responsivity (R) of 1.3*104 V/W were obtained, which are comparable with the research carried out so far an‎d show the remarkable performance of the fabricated nanogenerator as a mechanical energy storage device an‎d simultaneously a light sensor. In this research, eight different triboelectric nanogenerators were made an‎d compared. The effect of different parameters such as coating methods, type of substrates, type of electrodes, type of carrier phases, concentration of suspensions, composition of composites, area of layers, number of coating layers, frequency, an‎d optimal resistance were investigated. Finally, among the introduced nanogenerators, the nanogenerator based on polyvinyl chloride/Mxene composite (negative layer) an‎d polyvinyl alcohol/coconut fiber biocomposite (15% by weight) (positive layer) had the highest output power an‎d the highest durability. This multifunctional nanogenerator based on Mxene has a high potential in harvesting an‎d measuring energy, which paves a new way to simultaneously use mechanical energy an‎d light from our surroundings.

فتح اله كريم زاده , محمدحسين عنايتي

حميدرضا سليمي جزي , مهران نحوي , بهروز موحدي