Synthesis and Characterization of Carbon Nanofibers Grown on Ni and Mo Catalysts by Chemical Vapor Deposition

摘要

In this study, we synthesized carbon nanofibers using Ni and Mo catalysts by chemical vapor deposition. Catalysts used in the synthesis of carbon nanofibers were prepared by changing the molar ratio of nickel nitrate and ammonium molybdate. Precipitates were then obtained by reacting with ammonium carbonate. The optimum temperature for synthesis of carbon nanofibers was found by changing it between 600 and 800 degrees C. At these temperatures, carbon nanofibers were synthesized with various ratios of catalysts. Structural and physiochemical properties were analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Raman, and X-ray photoelectron spectroscopy. The specific surface area of synthesized carbon nanofibers was measured by BET. It was found that characterization of carbon nanofibers were significantly affected by the synthesis temperature and the concentration ratio of metal catalysts. When the catalyst with the concentration ratio of Ni and Mo was 6:4 at 800 degrees C, uniform carbon nanofibers with a diameter of 50nm were grown. Crystallinity and amorphicity of the synthesized carbon nanofiber were excellent compared to those of carbon nanofibers synthesized with metal catalysts in different concentration ratios. A three-electrode cell was prepared by using the synthesized carbon nanofibers as anode of Li secondary battery. The electrochemical properties of carbon nanofibers were examined through cyclic voltammetry and galvanostatic charge-discharge.