以Ir（acac）₃和H₂PdCl₄为前驱体，三缩四乙二醇（TEG）为溶剂和还原剂，抗坏血酸（AA）为共还原剂，聚乙烯吡咯烷酮（PVP）为稳定剂，KI为形貌控制剂，微波辐照120 s，得到形貌单一、大小均匀的Ir-Pd双金属三八面体纳米晶。反应体系中Ir（acac）₃∶H₂PdCl₄∶AA∶KI∶PVP最适宜摩尔比为1∶3∶2∶10∶15。利用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X-射线粉末衍射（XRD）、X-射线光电子能谱（XPS）对其结构进行了表征。所合成的Ir-Pd双金属三八面体纳米晶催化甲酸电氧化的活性约为商业Pd黑的2.5倍。

Uniform and well-defined Ir-Pd bimetallic trioctahedral nanocrystals with an average size of 50 nm are synthesized by using Ir(acac)₃ and H₂PdCl₄ as precursors,tetraethylene glycol (TEG) as solvent and reduction agent,ascorbic acid (AA) as a co-reduction agent,polyvinylpyrrolidone (PVP) as a stabilizer,KI as a shape-controlled agent under microwave irradiation for 120 s.In the reaction system,the optimum molar ratio of Ir(acac)₃∶H₂PdCl₄∶AA∶KI∶PVP is 1∶3∶2∶10∶15.The products are characterized by transmission electron microscopy (TEM),scanning electron microscope (SEM),X-ray diffraction (XRD) and X-ray photoelectron spectrometry (XPS).The electrocatalytic activity of the as-prepared Ir-Pd bimetallic trioctahedral nanocrystals for electro-oxidation of formic acid is around 2.5 times that of the commercial Pd black.

苏嫚嫚(1992-),女,硕士研究生,主要从事纳米材料的研究,1569506871@qq.com