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Issue 38, 2015
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Heterostructured Au/Pd–M (M = Au, Pd, Pt) nanoparticles with compartmentalized composition, morphology, and electrocatalytic activity

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Abstract

The synthesis, processing, and galvanic exchange of three heterostructured nanoparticle systems is described. The surface accessibility and redox potential of a Au/Pd–Ag dumbbell nanoparticle, where a Au/Pd core/shell region, and a silver region make up the domains, was used to prepare the new nanostructures with controlled composition, morphology, and microstructure. Results indicate that the silver domain was particularly susceptible to galvanic displacement, and was exchanged to Au/Pd–M (M = Au, Pd, Pt). Interestingly, the dumbbell morphology remained after exchange, and the silver region was transformed to hollow, parachute, or concentric domains respectively. The morphology and microstructure change was visualized via TEM and HRTEM, and the composition changes were probed via STEM-EDS imaging and XPS. The electrocatalytic activity of the Au/Pd–M towards methanol oxidation was studied, with results indicating that the Au/Pd–Pt nanoparticles had high activity attributed to the porous nature of the platinum domains.

Graphical abstract: Heterostructured Au/Pd–M (M = Au, Pd, Pt) nanoparticles with compartmentalized composition, morphology, and electrocatalytic activity

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Publication details

The article was received on 30 May 2015, accepted on 20 Aug 2015 and first published on 26 Aug 2015


Article type: Paper
DOI: 10.1039/C5NR03562G
Citation: Nanoscale, 2015,7, 15748-15756
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    Heterostructured Au/Pd–M (M = Au, Pd, Pt) nanoparticles with compartmentalized composition, morphology, and electrocatalytic activity

    P. S. Lutz, I. Bae and M. M. Maye, Nanoscale, 2015, 7, 15748
    DOI: 10.1039/C5NR03562G

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