Effect of Polytetrafluoroethylene Doping on the Output Performance of Elastic Based Triboelectric Nanogenerator
The elastic triboelectric nanogenerator(TENG)can convert mechanical energy of elastic deformation into electrical energy.However,the electrical output performance of elastic materials decreases due to the reduction of contact area during elastic deformation.The elastic TENG is considered as an ideal model for elastic energy harvesting and output device.In this work,the elastic porous polyurethane triboelectric material was prepared by conventional natural foaming method,and the dielectric material polytetrafluoroethylene(PTFE)was mixed with uniform and gradient doping to improve the electrical output performance.Uniform doping electrical output performance decreases with the increase of foam ratio,with the increase of PTFE content showing a trend of first increase and then decline,at the foam ratio of 2:1 and PTFE doping content of 3%,the uniform doping elastic porous TENG amount of transfer charge,open-circuit voltage and short-circuit current are 52 nC,133.6 V and 1.3 μA.The output performance of gradient doping increases with the increase of PTFE gradient content ratio.When the gradient ratio is 3:1,the charge transfer quantity,open-circuit voltage and short-circuit current of the gradient doping elastic porous TENG are increased by 32.65%,33.33%and 9%,respectively,compared with the uniformly doping elastic porous TENG under the same conditions.Through the finite element simulation of potential distribution and interaction electrodynamics theory,it is deduced that the gradient doping results in an uneven gradient electric field inside the triboelectric material,which increases the movement of triboelectric charge to electrode.Therefore,it is verified that the output performance of TENG with gradient doping is better than that with uniform doping.This study provides a new idea for the design and preparation of elastic porous polyurethane triboelectric materials.
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