摘要
极其细小的 mesoporous 钨碳化物(WC ) 用高精力的球 milling 处理从同样综合的 mesoporous WC 被准备。X 光检查衍射(XRD ) ,扫描电子显微镜学(SEM ) ,和氮吸附解吸附作用技术被用来描绘样品。WC 样品的 Brunauer-Emmett-Teller (赌注) 表面区域与增加的球 milling 时间增加了并且在 1011 m2
Ultrafine mesoporous tungsten carbide (WC) was prepared from as-synthesized mesoporous WC using high-energy ball milling treatment. X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption techniques were used to characterize the samples. Brunauer-Emmett-Teller (BET) surface areas of WC samples increased with the increasing ball milling time and kept constant at 10-11 mZog 1 for over 9 h. The electrocatalytic properties of methanol electro-oxidation at WC powder microelectrodes were investigated by cyclic voltammetry, chronoamperometry, and quasi-steady-state polarization techniques. The results reveal that ball-milled WC exhibits higher activity for methanol electro-oxidation than as-synthesized mesoporous WC. The suitability of ball-milled WC for methanol electro-oxidation is better than platinum (Pt) micro-disk, although the current peak is not as high as the Pt micro-disk. Moreover, increasing the methanol concentration and reaction temperature promotes methanol electro-oxidation on ultrafine mesoporous WC.
基金
Project supported by Science and Technology Major Project in International Cooperation of Zhejiang Province (No. 2008C14040), Key Project of Natural Science Foundation of Zhejiang Province (No. Z4100790) and International Science & Technology Cooperation Program of China (No. 2010DFB63680).