Nanostructured carbide-derived carbon synthesized by chlorination of tungsten carbide

摘要

Nanostructured carbide-derived carbons were synthesized from α-tungsten carbide (WC-CDC) powder via gas phase chlorination within the temperature range from 700 to 1100 °C. Analysis of X-ray diffraction results showed that WC-CDC are mainly amorphous consisting of relatively small graphitic crystallites and the apparent crystallite size along the a- and c-directions of graphite structure L_a ≈ 4nm and L_c=1.5nm were calculated. The first-order Raman spectra showed the graphite-like absorption peak at ~1590 cm~(-1) and the disorder-induced peak at ~1350 cm . The low-temperature N2 sorption experiments were performed and a specific micropore surface area up to 1550 m~2 g~(-1) and total pore volume up to 0.89 cm~3 g were obtained for WC-CDC synthesized at T = 1100 °C. High-resolution transmission electron microscopy and electron energy loss spectroscopy studies revealed that WC-CDC prepared at 800 °C correspond to the highly disordered carbon material but WC-CDC prepared at 1100 °C showed partial graphitization.