Synthesis And Property Study Of Carbon-Based Nanomaterials

In recent years,with the development of industrialization,the oil and other non renewable fossil fuels are consuming heavily and causing great damage to the human living environment.In order to cope with the energy crisis and meet the needs of sustainable development,the development and use of clean energy and materials have become the focus of the world.Owing to the excellent specific surface area,porosity,electroconductivity,thermal conductivity and tunable pore size structure,carbon-based nanomaterials play an important role in energy,separation and catalytic applications.Therefore,researchers aim to develop a more environmental friendly,simple and feasible synthesis route of carbon-based nanomaterials and improve the performance and application of carbon-based nanomaterials.Herein,we report a facile route in situ synthesis of different carbon-based nanocomposite materials and explore the photocatalytic and electrochemical properties of these carbon-based nanocomposite materials,further investigate the mechanism of electrochemistry and photocatalysis.A new type of high dispersion,high porosity and component adjustable carbon nanofiber?CNF?dominated electrode materials decorated with dilute iron and ruthenium oxide particles(Ru_x/Fe_10-x-CNF)has been in situ fabricated by direct pyrolysis of Ru,Fe,Zn-containing metal organic framework fibers.The morphology,crystal structure,pore structure,physical and chemical properties of the composite materials are characterized by scan electron microscope?SEM?,transmission electron microscope?TEM?,N₂ adsoprtion/desorption,X ray diffraction?XRD?,X ray photoelectron spectroscopy?XPS?,Raman,Infred spectrum?IR?and etc.Meanwhile,the supercapacitor performance of nanocomposite materials are measured by electrochemical measurement,such as the CV curve,constant current charge/discharge curve and EIS curve.With the increased of Ru loading,Ru_x/Fe_10-x-CNF capacitance value is volcano type,Ru₅Fe₅-CNF sample show a maximum specific capacitance of 197F/g.After scanning 5000 cycle at 5.00A/g,the retention rate of capacitance is 95%,it exhibits good cycle stability.In the second part of this thesis,we successfully prepare layered rGO/mpg-C₃N₄-x nanocomposites in situ fabricated by direct pyrolysis of melamine-CTAB-GO supramolecular aggregates,constructed via CTAB-directed selfassembly of nitrogen rich carbon source and graphene oxide dispersed in alkaline alcohol water mixed solution.The morphology,pore structure,physical and chemical properties of the composite materials are characterized by SEM,N₂adsoprtion/desorption,X-ray photoelectron spectrum?XPS?,IR,fluorescence spectroscopy?PL?,UV-Vis diffuse reflectance spectra?UV-vis DRS?and etc.With the increased of rGO loading,the photocatalytic properties of rGO/mpg-C₃N₄-x samples show volcano type,the rGO/mpg-C₃N₄-10 sample has the best photocatalytic activity,the degradation rate of methylene blue was 0.0201min^-1 which was 5 times,2 times and 6.7 times of bulk g-C₃N₄,mpg-C₃N₄ and P25,respectively.Due to its high surface area and heterogeneous structure between mpg-C₃N₄ and rGO,which is conducive to the photogenerated hole electron interface separation and transmission,while the photocatalytic performance of rGO/mpg-C₃N₄-10 sample was enhanced.