Research And Preparation Of Foot Flexible Triboelectric Nanogenerator

With the rapid development and progress of society,new energy technologies are rapidly developing in various fields.Triboelectric nanogenerator,as a new self-energizing technology can collect the mechanical energy which is produced by our surroundings including energy generated during exercise,and converting it into electric energy.Nowadays,it has received widespread attention.Triboelectric nanogenerator(TENG)is the combination of friction and electrostatic induction principle,and the most important part is the selection of friction material.Choosing two different kinds of material which can get and lost electrons easily.So based on the existing theory.Through the use of different types of yarn(fiber)materials,weaving them into different fabrics as a power generation pattern,and finally making a power generation device to explore the different factors that affect the power generation efficiency respectively.Finally,to improve the efficiency.The method which coating the cotton fabric with polyurethane and the adding copper nanoparticles in the polyurethane have been used,and the results are pretty well.The specific content of work and experimental findings are as follows:First of all,choose nylon,PTFE,polyester yarn and cotton fabrics.Using automatic sample weaving machine weaving different fabrics.Doing the research of different types of yarn,different fabric tightness and different yarn fineness woven which can affect the efficiency of triboelectric nanogenerator.The results show that with the increasing fineness of the woven fabric yarn,the output electrical properties are continuously improved.When the fineness of the nylon yarn is 280D/3,it comes into frictional contact with the woven fabric of PTFE yarn.The strongest signal can be getted,and with the increase of external resistance load,the output electrical signal is gradually increased.When the resistance reaches 30MΩ,the maximum open circuit voltage is 200V,its tend may be stable lately,and the maximum power density can be generated 1.06W/m~2.In addition,the electrical signal output is also increased as the weft density of the fabric is increased.When the weft density of the PTFE fabric is 50%,the maximum output signal is 200V,and the final test results analysis,nylon fabric output performance is obviously better than polyester and cotton fabric.Then,we also use knitting computerized flat knitting machine to fabricate different three-dimensional weft-spaced fabric.The effects of the fineness of spacer yarn,spacer yarn density and fabric thickness on the output performance of power plant were studied.The experimental results show that with the increasing fineness of spacer yarn,the effective contact area of the upper and lower two layers of friction material is reduced,so the final output performance is continuously weakened.When the spacer yarn fineness is 0.08mm,the maximum open voltage is 65V,the output signal is also weakened as the spacer yarn density increases.When the spacer yarn density is small,the electrical signal is strongest,reaching 80V.When the thickness of the spacer fabric is gradually increasing,the power generation performance is enhanced,the maximum open circuit voltage is80V.Finally,in order to improve the power generation efficiency,the surface of the cotton fabric is coated with polyurethane,and the copper nanoparticles are added to the polyurethane and then coated on the surface of the fabric to be used as a friction material to improve the power generation efficiency.As the result,with the increasing amount of polyurethane applied,the output electrical signal is also enhanced,the maximum open voltage was reached up to 400 V when 0.55 g of polyurethane was coated,and as the amount of polyurethane coating continued to increase,the output electrical signal was relatively weakened.But also measured under different humidity conditions on the output performance,as the ambient humidity increases,the output performance gradually weakened.When copper nanoparticles are added to the polyurethane,the electrical signal output is gradually increased to a maximum of 215V.Finally,the power generation unit is placed in the insole and used in conjunction with the insoles to collect the mechanical energy generated by walking.We can measure the open circuit voltage and short circuit current which are up to 430V and 4μA,the output signal is relatively stable.