1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology,Lanzhou 730050; 2 School of Science, Lanzhou University of Technology, Lanzhou 730050
Abstract: Carbon-encapsulated CoO core-shell structure nanoparticles were successfully prepared by DC arc discharge plasma technique. The product was characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and X-ray energy dispersive spectrometry (XEDS). Raman spectroscopy and low-temperature N2 adsorption/desorption were employed to determine the morphology, crystal structure, specific area, and pore structure of the nanoparticles. HRTEM indicated that the carbon-encapsulated CoO nanoparticles prepared by this method possess typical core shell structure. The particle morphology exhibits spherical or ellipsoidal structure with uniform particle size and good dispersion. The particle size distribution is in the range of 20—60 nm, the average particle size is 40 nm, and the thickness of the shell carbon layer is about 5 nm. XRD studies demonstrate that the core of the particles is CoO with face-centered cubic structure CoO, and the outer shell is disordered carbon layer. XEDS spectra confirmed the presence of Co, O and C elements in the sample. Raman spectrum showed the low degree of graphite in the sample and the occurrence of red shift phenomenon. The N2 adsorption and desorption isotherm belongs to type Ⅳ, the BET specific surface area is 33 m2/g, the BJH desorption cumulative pore volume and desorption average pore size are 0.078 cm3/g and 11 nm, respectively. The equivalent particle size is 43 nm, which is consistent with the results measured by TEM and XRD.
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2018, Vol. 32 
