Abstract
Vanadium carbide (V8C7) nanopowders can be synthesized by thermal processing the precursor of ammonium vanadate (NH4VO3), glucose (C6H12O6) and urea. The products were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) techniques. The results show that the single-phase V8C7 powders can be obtained at 1000 °C for 1 h. The powders exhibit the morphology of square or spheroidal and consist of multiple particles ∼200 nm in size. The surface of the specimen mainly consists of V, C and O three species elements. The V 2p peaks with the binding energy of 517.4, 516.2 and 513.6 eV are assigned to the V 2p3/2 species of V2O5, VO2 and V8C7, respectively. The XPS spectrum of O 1s energy region for vanadium carbide contains two peaks corresponding to OH− (532.2 eV) and V5+ (530.4 eV). The BET specific surface area, the average pore size and the measured are 17.60 m2/g, 2.44 nm and 0.06 cm3/g, respectively.
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