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Citation: SHENG Jiang-Feng, MA Chun-An, ZHANG Cheng, LI Guo-Hua. Preparation of Tungsten Carbide-Supported Nano Platinum Catalyst and Its Electrocatalytic Activity for Hydrogen Evolution[J]. Acta Physico-Chimica Sinica, ;2007, 23(02): 181-186. doi: 10.3866/PKU.WHXB20070209 shu

Preparation of Tungsten Carbide-Supported Nano Platinum Catalyst and Its Electrocatalytic Activity for Hydrogen Evolution

1.
Research Center of Nano Science and Technology, State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 19 June 2006
Available Online: 30 January 2007

Using ammonium metatungstate (AMT) treated by spay drying as precursors, the tungsten carbides (WC) catalyst with meso-porosity was prepared by gas-solid reaction in the atmosphere of CH4/H2. The WC-supported nano platinum (Pt) catalyst was prepared by impregnation. SEM and XRD results showed that the average diameter of the Pt particles which were well dispersed on the surface of Pt/WC, was about 13.5 nm. The electro-catalytic properties and chemical stability of the Pt/WC powder microelectrode (PME) for the hydrogen evolution reaction in acid solution were investigated using the electrochemical techniques of cyclic voltammetry and linear sweep voltammetry. The results showed that the Pt/WC-PME exhibited an attractive catalytic activity in hydrogen evolution with parameter a in Tafel equation was 0.292 V, and the exchange current density of hydrogen evolution was 4.42 mA·cm-2. When the over-potential was 250 mV, the activation energy of hydrogen evolution was 26.20 kJ·mol-1.
- Tungsten carbide;Platinum;Electrocatalysis;Hydrogen evolution
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