Preparation of tungsten carbide-supported nano Platinum catalyst and its electrocatalytic activity for hydrogen evolution

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• 作者：Chunan Ma ; Jiangfeng Sheng ; Nigel Br ; on ; Cheng Zhang ; Guohua Li
• 关键词：Tungsten carbide ; Platinum ; Nano particles ; Electrocatalysis ; Hydrogen evolution
• 刊名：International Journal of Hydrogen Energy
• 出版年：2007
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：September 2007
• 卷：32
• 期：14
• 页码：2824-2829
• 文件大小：1110 K

摘要

Using ammonium metatungstate (AMT) which was treated by Spay Drying as precursors, the tungsten carbide (WC) powders with meso-porosity was prepared by gas–solid reaction in the CH₄/H₂ atmosphere. The WC-supported nano platinum (Pt) catalyst was prepared by impregnation method with the as prepared WC and H₂PtCl₆. SEM and XRD results show that the average diameter of the Pt particle which well dispersed on the surface of Pt/WC is about 13.5 nm. The electrocatalytic properties and chemistry stability of the Pt/WC powder microelectrode (PME) for the hydrogen evolution reaction in acid solution were investigated by using the electrochemical techniques of cyclic voltammetry and linear sweep voltammetry. The results show that the Pt/WC-PME exhibited an attractive catalytic activity in hydrogen evolution with . The exchange current density of hydrogen evolution is . When the over-potential is 250 mV, the activation energy of hydrogen evolution is .