Preparation And Mechanism Of Paper-based Flexible Composite Triboelectric Nanogenerator

The continuous consumption of fossil energy such as coal and petroleum has brought serious energy shortages and environmental pollution in the world.The development of new materials that can collect clean and renewable energy to ensure sustainable power supply has become a research focus and hotspot in the field of energy and materials.Triboelectric materials can directly convert mechanical energy into electrical energy by inducing electrostatic charge through contact separation and deriving it through external circuit.As a new type of energy material,triboelectric material provides a unique solution for human to solve energy and environmental problems.Till now,traditional triboelectric materials have been widely studied,but the complexity of their preparation process and the long preparation cycle have greatly restricted their large-scale application in the industrial field,the flexible fiber friction power generation material provides a new direction for the further development of traditional triboelectric materials.In this paper,wet molding and surface coating processes are used to prepare the gain and loss electronic layer of the triboelectric nanogenerator,and the influences of the two preparation processes on the performance of the triboelectric layer are analyzed;the paper-based intermediate fiber layer is prepared to explore the relationships among the preparation processes,structure and performance;the paper-based flexible composite triboelectric nanogenerator is constructed by assembling each layer structure,and the influence law and mechanism of external environmental factors on the output performance of the triboelectric nanogenerator are studied.The main research contents are as follows:(1)The triboelectric layer material is prepared by wet molding and surface coating process.In the wet forming process,the effects of hot pressing pressure and temperature on the structure and performance of the triboelectric layer material are studied.The experimental results show that the optimal hot pressing temperature and pressure of the electron-loss layer nylon 6 fiber paper are 150℃and 15 MPa respectively;the optimal hot pressing temperature and pressure of the polypropylene fiber paper for the electronic layer is 120℃and 15 MPa respectively;the overall output voltage is about 19.8 V under the optimal process conditions.In the surface coating process,the influence of coating concentration and coating amount on the structure and performance of the triboelectric layer material was studied.The experimental results show that the optimal coating concentration of nylon 6 is 8%,and the best peak output voltages obtained by coating paper-based materials with nylon 6 and polytetrafluoroethylene solution are 22.3 V and 23.6 V,respectively.In comparison,the triboelectric layer material prepared by the surface coating process has better electrical properties.(2)The paper-based intermediate layer material was prepared from cellulose fiber and the intermediate layer was punched to study the influence of paper weight,bulk,hole spacing,and pore size on the structure and performance of the intermediate layer material.The experimental results show that under vacuum drying condition,when the paper weight is 140 g/m~2,the pore size is 1 mm,and the pore spacing is 3 mm,the output voltage of about 12 V can be obtained.The peak output voltage of about 13 V can be obtained by increasing the bulk thickness of the intermediate layer to 5.8 cm~3/g.The paper-based intermediate layer maintains the flexibility of TENG,and at the same time endows TENG with stability in structure and electrical properties.(3)Research on the assembly and performance of paper-based composite triboelectric nanogenerators.The triboelectric nanogenerator was assembled by triboelectric layer material and the interlayer material prepared by the optimal process.The morphology and bonding degree of each layer of the triboelectric nanogenerator were observed by SEM and micro CT,and its electrical output performance was tested.The research found that:under the size of 4×2cm~2,the optimal working frequency of the generator is 1 Hz;under the condition of 50 N,the output voltage of the generator is 15 V.The output performance of the generator basically has no attenuation before and after humidity changes,and it can remain stable after 500 cycles of stability testing.The triboelectric nanogenerators obtained in this study have good flexibility and tailorability,and can be widely used in the field of human detection.