The Study On The Polyaniline/Carbon Fiber Flexible Electrode Materials For Supercapacitor

As one of conducting polymers,polyaniline(PANI)has advantages of high specific capacitance,fast rate of charging/discharging and simply preparation condition,therefore it received widely attention from researchers;As a pseudo-capacitance material as well,the microstructure of PANI is closely linked to its electrochemical performance.Researchers always exploit the high specific capacitance and ease the low structural stability of PANI mainly in the following two aspects.On the one hand,the preparation of uniform nanofibers or nanowires could increase the active specific surface of PANI to electrolyte and effectively alleviate the resistance of ion embedding/protrusion in the process of charging/discharging,which could improve the mechanical stability of PANI electrode materials.On the other hand,combining the PANI with carbon or metal oxide materials could synthetise binary or ternary composite with high specific capacitance and high stability structure through favorable synergy between each component.Based on the ideas above,we have designed the following three experiments in this paper.(1)We have prepared the polyaniline/carbon cloth(CC-PANI)composites by the method of manganese dioxide template and the carbon cloth was used as the flexible collector.Also,the optimum PANI preparation duration has been explored.Among them,CC-PANI-8h electrode material owns the most stable rate performance and the highest electrochemical activity.From 0.5A/g to 10A/g,the specific capacitance retention of CC-PANI-8h is 64.5%and the specific capacitance could still reach as high as 429.42 F/g even at 10A/g.(2)We have used TEOS doped-CNF as carbon matrix to prepare polyaniline/carbon nanofibers(PANI/SiCNF)binary composite materials,and as well the best doping concentration of TEOS was explored.The morphology of PANI exhibits slightly different with different doping concentration,and when the doping percentage is 30%,the PANI/SiCNF-30 sample achieves the best rate capacity and high specific capacitance(433.54F/g at 1A/g and up to 286.97F/g at 20A/g,the latter is about 184F/g higher than the PANI/CNF material and 50 F/g higher than the pure PANI material).(3)We have successfully preparaed the polyaniline/manganese dioxide/carbon nanofiber(PANI/MnO2/NPCNF)ternary composite materials through three-part experiment.In this part,we have explored the best MnO2 preparation duration.The results demonstrate that the PANI/MnO2(90min)/NPCNF has the highest specific capacitance,whose capacitance could reach 587.3F/g at 0.5A/g(about 1.3 times than binary composite PANI/NPCNF),the good rate performance and cycling stability,whose capacitance retention is 63.65%from 0.5A/g to 20A/g and the capacitence could still up to 328F/g(80%retention)even after 1000 cycles at 5A/g.