【摘要】 采用喷雾干燥法和还原炭化处理制备具有中空介孔结构的碳化钨钴复合粉(HTCCS),其中,钴的质量含量为6%。在碳化钨钴复合粉表面的钴和氯化钯发生置换反应,得到纳米Pd/WC复合催化剂。采用X射线粉末衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对样品的形貌和晶型结构进行了表征。结果表明,5.0-6.0 nm钯纳米粒子取代钴均匀分布在碳化钨微球表面。采用循环伏安和计时电流法研究了在酸性溶液中Pd/WC催化剂对甲酸的电催化氧化性能,结果表明,Pd/WC催化剂比Pd/C催化剂对甲酸呈现出更高的电催化氧化活性和稳定性。更多还原

【Abstract】 Hollowtungsten carbide and cobalt spheres( HTCCS) with cobalt concentration of 6% were prepared by spray conversion and reduction carbonization methods.The HTCCS with diameters of about 8- 18 μm were covered with 0.3- 1.0 μm microporous.The Pd/WC catalyst was prepared through the replacement reaction between Co nanoparticles on the surface of HTCCS and Pd Cl4.The electro-catalytic performances for formic acid electro-oxidation were investigated by cyclic voltammetry and chronoamperometry.It exhibited the lowonset potential,excellent catalytic activity and stability compared with Pd/C due to the larger electrochemical surface area( ECSA) and the synergistic effect between Pd and WC.更多还原