Citation: HU Xian-Chao, CHEN Dan, SHI Bin-Bin, LI Guo-Hua. Preparation of Tungsten Carbide and Titania Nanocomposite and Its Electrocatalytic Activity for Methanol[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2863-2871. doi: 10.3866/PKU.WHXB20112863 shu

Preparation of Tungsten Carbide and Titania Nanocomposite and Its Electrocatalytic Activity for Methanol

HU Xian-Chao ^1,2 ,
CHEN Dan ¹ ,
SHI Bin-Bin ¹ ,
LI Guo-Hua ^1,3,4,

1.
1. School of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China;
2. Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310032, P. R. China;
3. State KeyLaboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, P. R.China;
4. Research Center of Nanoscience and Technology, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 21 July 2011
Available Online: 7 September 2011
Fund Project: 国家自然科学基金(21173193) (21173193)浙江省自然科学基金(Y406094, Y4080209) (Y406094, Y4080209)浙江省科技计划(2007F0039)资助项目 (2007F0039)

Tungsten carbide and titania nanocomposite with a core-shell structure was fabricated by combing chemical immersion with carbonization-reduction, using titania nanopowder as a support and tungsten hexachloride as a tungsten precursor. The crystal phase, morphology, microstructure, and chemical composition of the sample were characterized by X-ray diffraction, transmission electron microscopy, high resolution scanning transmission imaging, and energy dispersive spectroscopy (EDS). The results show that the crystal phase of the sample is composed of rutile, Ti₄O₇, WC, W₂C, and W_xC. The tungsten carbide particles coat onto the surface of the rutile support and thus form a core-shell structure. The electrocatalytic activity of the sample for methanol was measured by cyclic voltammetry with a three-electrode system in an alkaline solution. The results indicate that the electrocatalytic activity of the sample is higher than that of a pure titania phase and WC. The improvement in electrocatalytic activity is related to the reduction-carbonization time, the W to Ti molar ratio, the completeness of the shell layer in the core-shell structure, and the crystal phase of the sample. These factors can be correlated to a synergistic effect between titania and tungsten carbide in the nanocomposite. These imply that titania is a suitable support for the enhancement of the electrocatalytic activity of tungsten carbide.
- Tungsten carbide,
- Rutile,
- Nanocomposite,
- Core-shell structure,
- Electrocatalytic activity
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