Preparation and characterization of carbon-encapsulated NiO nano particles

Carbon encapsulated NiO(NiO@C) nano particles were successfully prepared by DC arc discharging plasma technology. The product is characterized by HRTEM, XRD, X-ray energy dispersive spectrometry (XEDS), Raman spectroscopy and low-temperature N₂ adsorption desorption to determine the morphology, crystal structure, particle size, specific area and pore structure. The experimental results indicate that the NiO@C nano-particles prepared by DC arc plasma technology possess typical core shell structure, the core of the particles is NiO with face centered cubic structure, and the outer shell is disordered carbon layer. The particle morphology exhibits cube structure with uniform particle size and good dispersion. The particle size distribution is in the range of 30-70 nm, the average particle size is 50 nm, and the thickness of the carbon shell is about 5 nm. The BET specific surface area of the carbon encapsulated NiO nano particles is 28 m²/g, and the equivalent particle size is 46 nm, which is consistent with the results measured by HRTEM and XRD. Raman spectrum shows that the degree of graphite in the sample is low, and the red shift phenomenon occurs.