离子液体中水热合成Pt-Pd/MWCNTs和Pd/MWCNTs催化剂

Preparation of Pt-Pd/MWCNTs and Pd/MWCNTs Catalysts by Hydrothermal Synthesis in Room Temperature Ionic Liquids

采用水热合成法,以离子液体1-乙基-3-甲基咪唑四氟硼酸盐(C6H11BF4N2,EMIBF4)为溶剂制备了Pt-Pd/MWCNTs(Multi-walled carbon nanotubes)和Pd/MWCNTs催化剂.X射线衍射(XRD)和X射线能量散射谱(EDS)测试证明了Pt-Pd合金和Pd纳米颗粒在MWCNTs的表面生成.透射电子显微镜(TEM)照片不仅证明了在MWCNTs表面Pt-Pd,Pd纳米颗粒的生成,而且还表明样品颗粒的平均粒径约为4 nm.循环伏安(CV)和交流阻抗(EIS)测试表明,在碱性环境下,乙醇在Pt-Pd/MWCNTs和Pd/MWCNTs修饰的玻碳(GC)电极上均能发生氧化反应,与Pd/MWCNTs修饰的电极相比,在Pt-Pd/MWCNTs上乙醇的起峰电位负移了大约200 mV,且具有更高的氧化峰电流值.

The Pt-Pd/MWCNTs and Pd/MWCNTs were successfully prepared by a hydrothermal synthesis in which room temperature ionic liquid（RTILs） of EMIBF4 was used as solvents.XRD and EDS analysis strongly demonstrated the formation of Pt-Pd and Pd nanoparticles on the surface of MWCNTs.TEM images not only proved the preparation of Pt-Pd and Pd nanoparticles,but also illustrated that the average particle diameter of the obtained nanoparticles is close to 4 nm.CV and EIS tests showed in alkaline electrolyte,ethanol oxidation reaction（EOR） could proceed on the obtained catalysts modified GC electrode,also,except for the enhanced oxidation peak current,the potential onset of EOR was greatly negatively shifted for about 200 mV on the Pt-Pd/MWCNTs modified GC electrode compared with the case on the Pd/MWCNTs modified GC electrode.