Synthesis of Ultrafine Mesoporous Tungsten Carbide by High-energy Ball Milling and Its Electrocatalytic Activity for Methanol Oxidation

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...

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Bibliographic Details
Published in:Chinese journal of chemistry 2011-04, Vol.29 (4), p.611-616
Main Author: 马淳安 陈赵扬 赵峰鸣
Format: Article
Language:English
Subjects:
high energy ball milling
mesoporosity
methanol electro-oxidation
tungsten carbide
扫描电子显微镜
极化技术
甲醇电氧化
电催化活性
超细碳化钨
高能球磨
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Summary: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.
ISSN:1001-604X
1614-7065
DOI:10.1002/cjoc.201190130