Controlled synthesis of dendritic Au@Pt core-shell nanomaterials for use as an effective fuel cell electrocatalyst

被引：109

作者：

Wang, Shuangyin ^{[2
]}

Kristian, Noel ^{[2
]}

Jiang, Sanping ^{[1
]}

Wang, Xin ^{[2
]}

机构：

[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[2] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 639798, Singapore

来源：

NANOTECHNOLOGY | 2009年 / 20卷 / 02期

关键词：

MORPHOLOGICAL CONTROL; GOLD NANOPARTICLES; METAL NANOCRYSTALS; FORMIC-ACID; PLATINUM; NANOSTRUCTURES; REDUCTION; OXIDATION; METHANOL; GROWTH;

D O I：

10.1088/0957-4484/20/2/025605

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the controlled synthesis of dendritic Au@ Pt core-shell nanomaterials. The size and morphology of the Au cores and the Pt shell thickness of the Au@ Pt core-shell nanostructures could be easily tuned. It was found that the directing agent and the reducing agent play critical roles in the synthesis of dendritic Au@ Pt core-shell nanomaterials. For comparison purposes, conventional Au@ Pt core-shell nanoparticles and monometallic Pt nanoparticles were also synthesized by the successive reduction method. Transmission electron microscopy ( TEM) observations demonstrated the dendritic surface of the products obtained. The UV-visible ( UV-vis) spectroscopy results and a comparison of the average diameter between the dendritic Au@ Pt and conventional Au@ Pt confirmed the relatively loose Pt shells around Au cores for the dendritic Au@ Pt. The as-prepared dendritic Au@ Pt showed enhanced electrocatalytic activity for methanol oxidation in acid medium, compared to the conventional Au@ Pt and monometallic Pt.

引用

页数：9

共 31 条

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