关键词: 溶胶-凝胶法, 纳米碳化钨, 微观结构, 催化

Abstract: Nano-WC particles were prepared by Sol-Gel using tungsten powder as the tungsten source and phenol formaldehyde resin as carbon source. The working electrode of proton exchange membrane fuel cell was obtained from taking Nafion coating solution to the surface of the Pt/WC composite particles which was synthesized by reduction of H₂PtCl₆·6H₂O using carbinol (HCHO) as reducing agent from the suspended liquid mixed H2PtCl₆·6H₂O and WC. Fourier transform infrared spectroscope (FTIR), X-ray diffraction (XRD), SEM and transmission electron microscope (TEM) were used to characterize the samples and the precursors, and used cyclic voltammetry to test the electrochemical activity of working electrode. The results showed that WC of (100) preferred orientation could be fabricated by Sol-Gel method, its interplanar spacing was 0.25nm, and the interplanar spacing of Pt was 0.23nm with preferential orientation of (111). The current density of 10wt% Pt/WC was up to 28.5mA/cm² in 0.5mol/L H₂SO₄, and the synergistic catalytic effect was found between nano-WC and Pt.

Key words: Sol-Gel, nano-tungsten carbon, microstructure, catalyst