硫代硫酸盐
水溶液
铂金
抗坏血酸
材料科学
催化作用
胶体金
纳米颗粒
还原剂
离子
化学工程
纳米结构
电催化剂
无机化学
化学
纳米技术
电化学
电极
物理化学
有机化学
冶金
硫黄
食品科学
工程类
作者
Shaojun Guo,Liang Wang,Shaojun Dong,Erkang Wang
摘要
In this paper, we have explored a simple and new strategy to obtain quasimonodisperse Au/Pt hybrid nanoparticles (NPs) with urchinlike morphology and controlled size and Pt shell thickness. Through changing the molar ratios of Au to Pt, the Pt shell thickness of urchinlike Au/Pt hybrid NPs could be easily controlled; through changing the size of Au NPs (the size was easily controlled from ∼3 to ∼70 nm via simple heating of HAuCl4-citrate aqueous solution), the size of urchinlike Au/Pt hybrid NPs could be facilely dominated. It should be noted that heating the solution (100 °C) was very necessary for obtaining three-dimensional (3D) urchinlike nanostructures while H2PtCl6 was added to gold NPs aqueous solution in the presence of reductant (ascorbic acid). The electrocatalytic oxygen reduction reaction (ORR, a reaction greatly pursued by scientists in view of its important application in fuel cells) and the electron-transfer reaction between hexacyanoferrate(III) ions and thiosulfate ions of urchinlike Au/Pt hybrid NPs were investigated. It is found that the as-prepared urchinlike Au/Pt hybrid NPs exhibited higher catalytic activities than that of ∼Pt NPs with similar size.
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