Controlled synthesis of dendritic Au@Pt core–shell nanomaterials for use as an effective fuel cell electrocatalyst
- 9 December 2008
- journal article
- research article
- Published by IOP Publishing in Nanotechnology
- Vol. 20 (2), 025605
- https://doi.org/10.1088/0957-4484/20/2/025605
Abstract
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.Keywords
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