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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。
We studied the photochemical synthesis of Pd nanoparticles in PEG-acetone system and the photodegradation of Pt (IV) ions on the Pd nanoparticles obtained in the same system to obtain Pd core @ Pt shell nanoparticles. By changing the Pd seed to Pt (IV) ratio, the Pt shell thickness of the composite particles can be effectively adjusted. The results of HR-TEM and XPS indicated that the average particle size of the obtained nanoparticles was 5.3-7.1 nm and had a core-shell composite structure. Electrochemical analysis showed that Pt core @ Pt shell nanoparticles with Pd: Pt molar ratio of 1: 1, 4: 1 possessed the similar catalytic activity and stability as Pt with lower cost and could be used as an anode catalyst for direct methanol fuel cell material.