The Power Management Of Triboelectric Nanogenerator For Degradation Of Organic Dyes

With the increase of water pollution by organic dyes,the degradation of organic dyes in wastewater has become an urgent problem to be solved.Electrochemical degradation has been considered to be one of the most effective methods for degrading organic dyes due to its simple equipment,easy operation and no secondary pollution.However,the traditional electrochemical degradation processes consume a large amount of energies which mainly come from the fossil fuel.This kind of degradation brings up even more environmental pollutions which is contrary to the starting point of the method.In recent years,the triboelectric nanogenerator(TENG)as a new energy technology that can effectively convert various types of mechanical energy into electrical energy has been invented.Compared with the traditional power supply methods,TENG has the advantages of low cost,sustainability,and no pollution,etc.Therefore,using TENG instead of the traditional power supply technologies to achieve electrochemical degradation of organic dyes has broad development prospects.However,the traditional TENG has a huge impedance,which limits its application in the degradation of organic dyes.Therefore,the development of a power management method is needed in order to reduce the impedance of the TENG,which can effectively improve the degradation efficiency of the organic dyes by the TENG.Introducing switches has been proved to be an effective method to reduce the impedance of the TENG.The management circuit based on the switches design can effectively enhance the output performance of the TENG.At present,the switches used in the TENG are mainly mechanical switches or electronic switches.However,the operation of the mechanical switch is controlled by mechanical triggering.In this case,the mechanical switch is necessary to match the movement of the TENG,therefore,the structure of the switch has to be elaborately designed,which increases the complexity and fabrication cost of the TENG system.Similarly,the electronic switch is necessary to match the electrical output of the TENG.Moreover,the electronic switch also consumes energy,which brings extra load for TENG reducing the effective energy output.Therefore,it is extremely important to develop a new type of switch in TENG system to overcome the existing problems for better management efficiency.In this paper,we have designed and fabricated an electrostatic vibrator switch which does not require external energy to trigger.Based on this switch,a transformer-based management circuit has been also designed and demonstrated.The introduction of the management circuit could realize the effective storage of the output energy of the TENG and the effective conversion from AC to DC.Moreover,the combination of TENG and the management circuit could improve the degradation rate of the organic dyes.This paper mainly includes the following two parts.(1)We have designed and fabricated a TENG with an electrostatic vibrator switch(TENG-EVS).Based on the output performance of the TENG-EVS we could conclude that the use of the electrostatic vibrator switch could optimize the output performance of the TENG;the mismatch of the impedances between the TENG and load resistance has been effectively solved.For example,when the load resistance is 0.1 M?,the output power and output energy of the TENG-EVS are about 1.4×10~6 and 1.4×10~3 times higher than that of the traditional TENG,respectively.In addition,by exploring the matching relationship between the vibrating frequency of the elastic vibrator and the rotation frequency of the TENG,a maximum energy output:132.5?J per cycle has been realized.(2)Both the power reserve circuit and the power supply circuit have been designed based on the electrostatic vibrator switch.Comparing with charging directly from TENG,the use of the power reserve circuit could enhance the efficiency of the energy storing by about 21.1 times.With this power supply circuit,the unstable alternating current(AC)output from the TENG can be converted into a stable direct current(DC).The capacity of the power supply has been maximized via optimizing the parameters of electronic components.For example,when the Ratio of the transformation is 1/22,the DC voltage and DC power of the power supply circuit reach 10.8 V and 0.12 mW,respectively.Moreover,the electrochemical degradation rate of methyl red is greatly improved by using this new TENG system.In summary,we have designed an electrostatic vibrator switch that can be applied to all modes of the TENG,and it provides a new idea for developing the low cost and high efficiency TENG system.In addition,the power reserve circuit and the power supply circuit have been also designed based on the electrostatic vibrator switch.By combining these two components,the effective storage and conversion AC to DC of the TENG output energy have been realized.Moreover,the electrochemical degradation rate of the methyl red dye by the TENG has been greatly improved by using this TENG system.The above research provides a new method for the electrochemical degradation of organic dyes in water.