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Preparation Of Metal Oxide/carbon Fiber@polyaniline Electrode Material And Its Electrochemical Performance

Posted on:2021-04-19Degree:MasterType:Thesis
Country:ChinaCandidate:S H WangFull Text:PDF
GTID:2432330602474967Subject:Engineering
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With the continuous development of science and technology products,supercapacitors play an increasingly important role in the field of energy storage devices,and people pay more and more attention to the research and development of high.performance supercapacitors.The core of this research is how to improve the performance of electrode materials for supercapacitors.Theoretically,all conductive materials can be used as electrode materials for supercapacitors,but in order to achieve better performance,it is now coMCFPon practice to combine different materials,which can compensate for each other's performance defects and generate synergies.The ultimate goal is to produce new composite materials with high capacitance and good cycle stability.In the current electrochemical energy storage research field,the transition metal oxide MnO2 and the conductive polymer PANI have initially demonstrated excellent electrochemical performance.Therefore,this research topic takes the above two kinds of materials and the carbon material matrix as the research object to prepare the supercapacitor composite electrode material.The microstructure of the electrode material is regulated by controlling the experimental parameters to improve its electrochemical performance and provide new methods for the research of supercapacitor.The main research contents of this paper are as follows:(1)Using the anode polymerization method,carbon fiber(CFs)pretreated in the prepared aniline solution was used as the anode and the graphite plate was used as the cathode,and the aniline monomer in the solution was oxidized to PANI at the CFs with the help of the rectifier.With the continuous extension of the reaction time,the wormlike PANI nanoribbon with multiple holes was finally formed by controlling the potential of the rectifier,and PANI in this state has the characteristics of rapid interfacial charge conduction.The successful combination of CFs and PANI ensures the synergistic effect in electrochemical performance,effectively reduces the internal resistance of composite materials and improves the specific capacity of electrode materialsAfter a series of electrochemical tests,it was found that the specific capacity of the CFs@PANI electrode material was 195.3 F/g at a current density of 1 A/g.After 1000 cycles of charge and discharge tests,the cycle retention rate was about 81.0%.(2)Spherical MnCO3 precursor was prepared by simple chemical precipitation method with MnSO4 and Na2CO3 as raw materials.MnO2 nanoparticles were prepared by sintering annealing at high temperature.The porous surface of the nanosphere greatly improves its specific surface area,which can provide more active sites for subsequent REDOX reactions and increase the specific capacity of the supercapacitor electrode material.(3)The spherical MnO2 nanoparticles were dispersed evenly in the aniline solution by ultrasonic dispersion method,and the aniline monomer with MnO2 nanoparticles was oxidized into PANI at the CFs by constant potential method.The grid.shaped PANI tightly fixed the spherical MnO2 nanoparticles on the carbon fiber,and the MnO2/PANI@CFs composite electrode material was finally prepared.By adjusting the concentration of MnO2 nanoparticles in the solution,it can be obtained that the highest specific capacity is 370.4 F/g when the concentration of MnO2 nanoparticles is 0.5 mol.This is because at this time,the layer spacing size of the composite microstructure is not only suitable for the fast ion transport,but also can keep the structure relatively stable.After 1000 cycles of charge and discharge test,the cycle retention rate is about 85.3%.
Keywords/Search Tags:carbon fiber, manganese dioxide, polyaniline, supercapacitor, composite materials
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