The Research Of Electrochemical Performance Of TiC/C Rarofibre Arrays And Metal Oxide Composite

Due to the shortage of petroleum resources and huge pollution to the environment ofemissions, the concept of energy conservation, emission reduction and green environmentalprotection becomes more and more important in today’s society. The new type of energy storagedevice-supercapacitor become a hotspot in current researches owing to its safty, goodenvironment compatibility, wide range of application and fast charging. But the low energydensity of supercapacitors restrict its application in commercial and industrial application, Howto improve the energy density of supercapacitor is the focus of our research.In this article, Core–shell TiC/C quasi-aligned nanofiber arrays have been prepared bychemical vapor deposition （CVD） method directly on titanium alloy substrate. Metal oxide （MO）with pseudocapacitor was coated on the TiC/C quasi-aligned nanofiber arrays and constructedMO/C/TiC composite electrode. This structure can make full use of MO pseudocapacitance andat same time provide a high speed channel of transmission and ionic migration, which greatlyimprove not only the energy density, but also the rate performance and power density.The main contents are as follows:（1） The loading of MnO₂nanoparticles onto the surface of TiC/C nanofibre arrays byelectrochemical depositon method, the amount of deposited MnO₂was regulated by depositiontime.The results indicate that and the specific capacitance loss only43%compared to that of10mV/s（685F/g） increased to1000mV/s（387F/g） of electrode of TiC/C/MnO₂-10s. Even theelectrode TiC/C/MnO₂-100s having mass MnO₂on the surface shows excellent rate performancewhich loss50%capacitance when the scan rate from10mV/s（395F/g） increased to1000mV/s（197F/g）.（2） The electrochemical deposition method was employed for the preparation ofTiC/C/MoO₃composites, and the influence of various quantity of MoO₃to the electrochemicalperformance of TiC/C/MoO₃electrode was discussed. Then TiC/C/Mo₂N composite wereprepared by temperature programmed reaction of TiC/C/MoO₃electrode in NH3gas. The resultsshow that the electrodes of TiC/C/MoO₃demonstrate favorable specific capacitance and cyclingperformance, but rate performance is relatively poor; after reation in NH3gas formedTiC/C/Mo₂N composite, even if the specific capacitance have been decreased, but the poor rateperformance have been greatly improved, and the cycling performance is slightly increased.