Preparation And Study Of 3D Flexible Inorganic Hybrid Carbon Nanofibers

Due to its characteristics of large surface area,good thermal stability,corrosion resistance,good conductivity,environmental friendly and excellent physical and chemical properties attracted widespread attention,carbon nanofibers are increasingly being used as active electrode materials,making up for the lack of traditional electrode which is expensive,environmental pollution.As an enhanced material for carbon nanofibers,inorganic hybrid carbon nanofibers are relatively less in the field of structural modification and electrochemical energy storage.In this paper,three dimensional ZrO₂,ZrC and ZrN nanoparticles hybrid carbon nanofibers were prepared by air spinning and subsequent carbon heat treatment.The fibers were homogeneous,stable,fluffy,flexible,and showed excellent resilience and folding characteristics.Owing to the good chelation of-CN and Zr',the inorganic nanoparticles are evenly dispersed in the carbon nanofibers.After the carbonization treatment,nitrogen integrate into carbon nanofibers,resulting crystallization resistance reduces and the mechanical property improvement.Meanwhile,pore structure of carbon fiber gather a lot of defects,inorganic nanoparticles toughen carbon fiber,and fiber inherited the complete structure of the initial stable and flexible.According to the analysis methods such as XRD,FT-IR,TEM,we can see the initial ZrOCl2·8H2O crystal fiber in carbonization process:zirconia crystal of tetragonal were discoved in 700 ? under argon atmosphere;ZrC appeared in 100? nder argon atmosphere;ZrN generated in 1400? under nitrogen atmosphere.The diamneter of ZrO₂,ZrC,ZrN nanoparticles decreased and the dispersion increasced will)the increase of the temperature of the carbon heat reaction.Ammonia adsorption on ZrO₂ carbon nanofibcrs?ZrO₂-CF?shows that the adsorption capacity of hybrid carbon nanofibers is about 10 times higher than that of pure carbon nanofibers?CF?,and the increase of carbonization temperature is conducive to the increase of adsorption capacity.This is due to the structure of adhesion after carbonization of pure carbon nanofibcrs,the flufy,complete and porous structure of the hybrid carbon nanofibers.To test the electrochemical performance of lithium ZrC,ZrN carbon nanofibers,the numerical impedance of ZrN carbon nanofibers?ZrN-CF?is lowest,compared to CF?300.00 ??,the impedance data of ZrN-CF?53.00??is reduced by about 5 times;the corresponding ZrN-CF in 0.1 A/g current density,specific capacitance is 110 mAhg-1,while the same current density pure carbon nano fiber is 68 mAhg-1;the optimal capacity retention of ZrN-CF is maintained at between 98%?99%.The doping of zirconium increases the band gap energy and increases the electron transfer rate,which is beneficial to the reduction of fiber resistance,while the introduction of nitrogen elements also reduces the charge transfer resistance.Finally,Zr0.05Ti4.95N carbon nanofibers were prepared for super power and minimum test AC impedance is 6.00 ? and in the current density of 0.1 A/g,the specific capacitance can reach 161 F/g,compared with the TiN?11.79?,141 F/g?carbon nanofibers,the CF?100.00?,109 F/g?and the electrochemical properties were improved.By studying the structure and electrochemical properties of Zr and Ti inorganic hybrid carbon nanofibers,we optimized the structure and properties of inorganic hybrid carbon nanofibers and hope to expand their future applications in flexible energy storage materials.