电催化氧化甲醇反应低成本高活性的Pd核@Pt壳纳米粒子的光化学合成与表征研究(英文)  

Photochemical Synthesis and Characterization of Pd@Pt Core-Shell Nanoparticles with Low Cost and High Activity for Methanol Electro-catalytic Oxidation

作　　者：董颖男[1] 杨喜昆[2] 李珊珊[1] 毕孝国[1] 唐美玲[1] 

机构地区：[1]沈阳工程学院,辽宁沈阳110136 [2]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2014年第12期2985-2988,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51164017,20863003)

摘　　要：研究了PEG-丙酮体系中光化学合成Pd纳米粒子并在同一体系内在获得的Pd纳米粒子表面光化学还原Pt（IV）离子获得Pd核@Pt壳纳米粒子。通过改变Pd晶种对Pt（IV）的比例,能够有效调节复合粒子的Pt壳厚度。经HR-TEM和XPS分析,结果表明,获得的纳米粒子的平均粒径为5.3~7.1 nm,具有核-壳复合结构。电化学分析表明Pd：Pt摩尔比1：1、4：1的Pt核@Pt壳纳米粒子具有与Pt相似的催化活性和稳定性,且成本更低,可能被用作直接甲醇燃料电池阳极催化材料。In the PEG-acetone solution system, the Pd@Pt core-shell nanoparticles were prepared by photochemical reduction of Pt（IV） on the surface of Pd nanoparticles which were firstly in-situ synthesized as the seed by a photochemical method. The thickness of Pt shell of the composite particles could be efficiently adjusted by changing the molar ratio of Pd seed to Pt（IV）. Core-shell composite structure of the obtained nanoparticles with average diameter in the range of 5.3-7.1 nm was confirmed by HR-TEM and XPS. The electrochemical tests indicate that Pd@Pt core-shell nanoparticles, in which Pd： Pt is 1：1 or 1：4, have the similar catalytic activity and the stability to those of Pt, while lower cost. Therefore, they can be used for anode catalyst materials of direct methanol fuel cell.

关 键 词：Pd核@Pt壳 光化学 电催化活性 甲醇氧化 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]