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Issue 16, 2011
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Polyoxometalate-stabilized Pt nanoparticles and their electrocatalytic activities

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Abstract

The synthesis of long-term stable polyoxometalate (POM)-stabilized Pt nanoparticles (NPs) is described here. By means of controlled bulk electrolysis, the reduced POM anions, SiW12O404 (or SiW12) and H2W12O406 (or H2W12), respectively, served the dual role of reductant and protecting/stabilizing ligand for the Pt NPs. Transmission electron microscopy (TEM) images confirmed the formation of 3 to 4 nm sized Pt NPs, which coincidently was in the same size range of the commercial Pt black that was used as a reference. Elemental XPS analyses showed W/Pt ratios of 0.12 for the SiW12- and 0.18 for the H2W12-stabilized Pt NPs, but found no evidence of the presence of Cl anion in the samples. Controlled electrochemical (EC), UV-Vis, and IR data provided unambiguous evidence for the structural integrity of the POM anions on the Pt NP surface. CO stripping, methanol oxidation reaction (MOR), and oxygen reduction reaction (ORR) were used to assess their electrocatalytic activities. It was found that both SiW12- and H2W12-stablized Pt NPs showed enhanced activities in MOR and ORR as compared to that of Pt black, with the latter having higher enhancement. These observations clearly demonstrated that the stabilizing POM anions have a profound influence on the electrocatalytic activity of the underlying Pt NPs.

Graphical abstract: Polyoxometalate-stabilized Pt nanoparticles and their electrocatalytic activities

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Publication details

The article was received on 07 Dec 2010, accepted on 21 Feb 2011 and first published on 14 Mar 2011


Article type: Paper
DOI: 10.1039/C0CP02805C
Phys. Chem. Chem. Phys., 2011,13, 7433-7438

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    Polyoxometalate-stabilized Pt nanoparticles and their electrocatalytic activities

    T. Hsu-Yao, K. P. Browne, N. Honesty and Y. J. Tong, Phys. Chem. Chem. Phys., 2011, 13, 7433
    DOI: 10.1039/C0CP02805C

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