Synthesis And Catalytic Properties Of PtPdBi Alloy Nanowires

One-dimensional (1D) noble metallic nanowire has the common properties ofnanomaterials because its two dimensions are within the range of nanoscale, and oftenexhibits different properties from spherical nanoparticle due to its unique shape. Inorder to enhance one of properties and endow it with new properties, synthesis ofmultiple noble metallic nanoparticles becomes one alternative. To date, bimetallicnanowires have been continually reported. This thesis will synthesize PtPdBi alloynanowire by the one-step wet-chemical method and studied its chemical catalytic andelectrocatalytic properties. The main contents are as follows:1. PtPdBi alloy nanowire with controllable compositions was synthesised by“one-pot” wet-chemical method. Transmission electron microscopy (TEM), highresolution transmission electron microscopy (HRTEM), scanning and transmissionelectron microscopy (STEM) and inductively coupled plasma mass spectrometry (ICP)were employed to characterize the morphology and composition of as-preparedPtPdBi alloy nanowires, revealing the growth mechanism of PtPdBi nanowires.2. Catalytic activity of PtPdBi alloy nanowires was evaluated by using thep-nitrophenol as the target molecule. The results indicated that the catalytic activity ofPtPdBi nanowires was composition-dependent. The PtPdBi nanowire with Pt:Pd:Biatomic ratio of55:38:7exhibited the best catalytic performance, which was betterthan PtBi, PdBi bimetallic alloy nanowires, PtPd, Pt and Pd spherical nanoparticles.3. Electrocatalytic properties of the PtPdBi alloy nanowires were studied byusing ethanol as the target molecule. The results showed that electrocatalytic activitystill depended on the composition of Pt, Pd and Bi elements. The PtPdBi nanowirewith Pt:Pd:Bi atomic ratio of55:38:7exhibited the best electrocatalytic performance,which was better than the PtBi, PdBi bimetallic alloy nanowires, spherical PtPd, Pt,Pd nanoparticles, and the commercial Pt/C catalyst.The excellent chemical catalytic and electrocatalyti cactivities of PtPdBinanowire with the atomic ratio, Pt:Pd:Bi=55:38:7, may be attributed to thesynergistic effect between different atoms in the alloy nanowires.