Study On The Preparation And Performance Of The Triboelectric Nanogenerator With Highly Efficient Air Filtration Function

As a disruptive energy technology,triboelectric nanogenerator(TENG)can convert ambient mechanical energy into electricity based on coupling effects of triboelectrification and electrostatic induction and is favored for the unique advantages such as low cost,simple design,and environmental friendliness.Combining TENG with electronics to construct self-powered systems is the direction and motivation for the development of smart electronic devices and Io T sensor units.Current studies on TENG mainly focus on performance improvement and application expansion.Triboelectric materials are directly related to the output performance and application capability of TENG as an important part of TENG.In this thesis,with the aim of improving the performance of triboelectric nanogenerator and nanofiber air filter,studies are carried out from the perspective of material optimization.PVDF/UiO-66 composite nanofibers with a?-phase content of 77.97%are prepared by using polyvinylidene fluoride(PVDF)nanofibers as the basic material and doped with 1.0 wt.%UiO-66particles.The output voltage,current,and transferred charge of TENG based on the composite nanofiber membrane reach 52.8 V?4.29?A,and 22.02 n C respectively,which are 5.1 times,6.5 times,and 8.0 times as large as those of pure PVDF-based TENG.Appropriate addition of UiO-66 promotes the transformation of the PVDF crystalline phase to?phase and increases the dielectric constant of the material.On the other hand,it increases the surface potential and thereby slows down the rate of charge decay.The above factors ameliorate the outputs of TENG synergistically.Applying TENG in traditional nanofiber air filtration materials can achieve extra highly-efficient removal of small-diameter particulate matter,which is a major advancement in air cleaning technology.PVDF/UiO-66 composite nanofiber membrane and the spun-bond fabric generate electrostatic charges by rubbing against each other and intercept particulate matter under the coupling mechanism of mechanical filtration and electrostatic attraction.Compared with the 79%and 33%removal efficiency of the uncharged air filter for PM_2.5 and PM_0.5,those of the charged PVDF/UiO-66 composite nanofiber membrane reach 99%and 92%,which are increased by 25%and179%and even comparable to the commercial face mask.More importantly,the triboelectric air filter can regenerate charges through manual friction after being washed several times,thus maintaining an excellent particulate matter filtration ability.This study not only introduces a method of improving the output performance of TENG from the perspective of material optimization through modifying PVDF nanofibers with the UiO-66 metal-organic framework,but also applies the TENG to the nanofiber material to demonstrate a reusable,highly-efficient triboelectric air filter.The results of this study open up a new way for the manufacturing and applications of TENG.