碳化钨/碳纳米管纳米复合材料的制备及其对硝基苯的电催化活性

Preparation and electrocatalytic activity of WC/CNT nanocomposite for nitrobenzene electroreduction

采用表面修饰技术和原位还原碳化技术制备了纳米碳化钨(WC)/碳纳米管(CNT)纳米复合材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和热重-差热分析(TG-DTA)等手段对WC/CNT纳米复合材料的晶相组成、形态结构和热稳定性进行了表征,结果显示样品是由WC和CNT两相构成,纳米WC颗粒均匀地分散在碳纳米管上,粒径细小;在空气气氛中,WC/CNT纳米复合材料在470℃以下保持稳定。采用循环伏安法研究了WC/CNT纳米复合材料对硝基苯的电催化活性和电化学稳定性。结果表明,WC/CNT纳米复合材料对硝基苯的电催化活性优于纳米WC和CNT,且WC/CNT纳米复合材料在硝基苯电还原过程中保持良好的化学稳定性。

Tungsten carbide（WC）/carbon nanotube（CNT）nanocomposite was prepared by surface decoration and in situ reduction techniques.The structure,morphology and thermal stability of the sample were characterized by XRD,SEM and TG-DTA methods.The results showed that the sample which was composed of WC uniformly supported on the surface of CNTs exhibited high thermal stability in air.The electrocatalytical activity and electrochemical stability of the WC/CNT nanocomposite for the electroreduction of nitrobenzene were investigated by cyclic voltammetry.The results showed that WC/CNT nanocomposite exhibited better catalytic activity for the electroreduction of nitrobenzene than separate WC nanoparticles and CNTs,and it also had good electrochemical stability during the process of electroreduction of nitrobenzene in acid solution.