| The properties of solid-liquid interface play a decisive role in interfacial phenomena,including surface interaction,ion exchange between interfaces,changes in surface physicochemical properties.There are usually exsist dendrites,pores at the electrode surface of a real electrochemical reaction process.They have micro or nano fractal structure which are extremely different from ideal mirror structure.Their interface diffusion,contact and friction are all deviated from the ideal parallel electric field model because the affection of the surface tension and many other factors.The traditional interface analysis method is difficult to monitoring the change state of the solid-liquid interface with fractal structure in real time.Therefore,its necessary to exploring new interface analysis and characterization methods.In recent years,The nanogenerator based on nano structure to enhancing triboelectricity effect has attracted much attention.And its output is closely related to interface contact and friction status.So,assembling a triboelectric nanogenerator(TENG)through the fractal structure electrodes,and the interaction between solid and liquid interface can be traced by reversing analysis of triboelectric signal.In this paper,a series of metal dendritic electrodes have been prepared,which have an approximate idealized fractal structure and can be used to simulate the electrical reaction interface with fractal fractured structures.Based on this,We investigated the relationship between the triboelectric signal of the electrode and the fluid state include velocity,acceleration,direction and composition and so on.And its revealed that there the fractal electrode can enhance the triboelectric effect of the liquid-solid interface heavily.and a self-powered flexible fabric structure flow field sensor is developed based on the frictional power generation effect of the fractal dendritic electrode interface.Potential applications in pipeline fluid safety monitoring.Based on the triboelectricity generation effect of the fractal electrode interface,a kind of self powered flexible fluid sensor textile was developed,which has potential application in the safety monitoring of fluid in pipelineResearch results mainly include the following aspects:(1)A novel electrode material with a series of metal dendritic structures was prepared through an easily scalable non-template aqueous electro-deposition method.In this paper,all immersed ring-shaped and slotted reactors were designed based on the fractal growth strengthen process.Metal micro-dendrite arrays were successfully grown on metal fiber,net and plate substrates.The electrical reaction interface with different micro/nano fractal characteristics can be simulated through control the growth of dendritic fractal structures by the growth voltage,time and other conditions.(2)The relationship between the triboelectric signal of fractal electrode and the fluid status was systematically investigated.A PTFE nano thin layer was covered on the surface of the dendrite electrode,and it was used in different flow fields.Then explored The relationship between the triboelectric signals and the fractal interface characteristics was investigated.It was found that the triboelectric output of the electrode can be decomposed into a DC signal related to the flow velocity and an AC signal related to the acceleration;the dendrite structure can enhance the triboelectric output of the electrode,and both the open circuit potential and the short circuit current can be improved more than 10 times in the same apparent area;the study further revealed that the actual solid-liquid contact coefficient of the fluid flow at the micro/nano fractal interface is about 0.6.(3)Developed a fractal dendritic enhanced immersion flexible fluid sensor.The sensor was fabricated by woving with the metal-fiber electrode and the PTFE/metal electrode in parallel.It found that the DC signal increases with the increase of the flow velocity.When the velocity is 0.5 m/s,the open circuit and short circuit currents can reach up to 6500.0 V/m~2 and xxx 1.3?A/m~2,respectively;the AC signal increases with increase of acceleration.When the acceleration is 7 m/s~2,the open circuit peak potential and the short-circuit peak current can reach up to 7666.6 V/m~2 and 54.3?A/m~2respectively;the AC/DC signal of the sensor textile is related to the fluid composition,the open circuit potential decreased from 0.92 V in ether to-0.016 V in ethanol.At the same time,a 600 mm~2 fabric can charge a commercial supercapacitor with 1?F to 1 V.This sensor textile can be used as a new type of self-powered safety sensor. |
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