Nanostructured carbide-derived carbon synthesized by chlorination of tungsten carbide

✍ Scribed by Indrek Tallo; Thomas Thomberg; Kyösti Kontturi; Alar Jänes; Enn Lust

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 910 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2011.06.033

✦ Synopsis

Nanostructured carbide-derived carbons were synthesized from a-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 % 4 nm and L c % 1.5 nm were calculated.

The first-order Raman spectra showed the graphite-like absorption peak at $1590 cm À1 and the disorder-induced peak at $1350 cm À1 . The low-temperature N 2 sorption experiments were performed and a specific micropore surface area up to 1550 m 2 g À1 and total pore volume up to 0.89 cm 3 g À1 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.