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Strain-induced Stranski-Krastanov growth of Pd@Pt core-shell hexapods and octapods as electrocatalysts for methanol oxidation

Abstract

Bimetallic nanocrystals with a branched shape have received great interest as catalysts due to their unique structures and fascinating properties. However, the conventional synthetic approaches based on the island growth mode often lead to the dendritic nanostructures with inhomogeneous and uncontrolled branches. Here precise control over the number of branches has been realized in the deposition of Pt on Pd seeds through the Stranski-Krastanov growth mechanism. Based on such growth mode, Pd@Pt core-shell hexapods and octapods have been generated by a seeded growth with Pd octahedra and cubes as the seeds, respectively. We found that Pt atoms are initially deposited on the side faces of Pd seeds through a layer-by-layer epitaxial growth in the presence of oleylamine (OAm), leading to local strain focused at their corners. These strain-concentrated sites promote the subsequent island growth of Pt atoms at their corners of the Pd seeds, resulting in the Pd@Pt core-shell hexapods or octapods. Both the Pd@Pt core-shell hexapods and octapods exhibit the substantially enhanced catalytic properties in terms of activity and stability towards methanol oxidation reaction (MOR) relative to the commercial Pt/C. Specifically, the Pd@Pt core-shell hexapods show the highest specific (1.97 mA/cm2) activity and mass activity (0.52 mA/μgPt) for MOR, which are 5.8 and 2.6 times higher than those of the commercial Pt/C, respectively. This enhancement can be probably attributed to their unique structures and synergistic effect between Pt and Pd.

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Supplementary files

Publication details

The article was received on 13 Apr 2017, accepted on 25 Jun 2017 and first published on 27 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR02638B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Strain-induced Stranski-Krastanov growth of Pd@Pt core-shell hexapods and octapods as electrocatalysts for methanol oxidation

    Y. Xiong, Y. Ma, J. Li, J. Huang, Y. Yan, H. Zhang, J. Wu and D. Yang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02638B

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