Rapid formation of nanoscale tungsten carbide on graphitized carbon for electrocatalysis

摘要

A simple, rapid and energy-saving method has been used to synthesize nanostructured tungsten carbide on graphitized carbon (WC/gC) materials. The procedures include the ion exchange of the ion-exchange resin as original precursor with targeting ions and heat treatment by an intermittent microwave heating (IMH) method. The resulting product was loaded by Pt nanoparticles to form a uniformly dispersed nanocomposite (Pt-WC/gC). The samples are characterized by physical and electrochemical methods. The Pt-WC/gC as electrocatalyst for oxygen reduction reaction shows high activity proved by the Pt-mass activity of 207.4 mA mg_(pt)~(-1) which is much higher than that of 107.4 mA mg_(pt)~(-1) on Pt/C at 0.9 V. The onset potential for methanol oxidation is 100 mV more negative than that on Pt/ C electrocatalyst. The synthesis of other types of nanomaterials based on this method is current under way to demonstrate the general suitability.