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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.