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Size-controlled synthesis of Au nanorings on Pd ultrathin nanoplates as efficient catalysts for hydrogenation

Abstract

Au nanorings are of particular interest in catalysis owing to their fascinating properties, however, it still remains a tremendous challenge to generate such hollow nanostructures with small size. Here we report the synthesis of Au nanorings with outer diameter less than 20 nm by a seed-mediated approach with Pd nanoplates as seeds in the presence of Ag+ ions. The incorporation of Ag+ ions substantially slows down the reduction rate of the Au precursor through an underpotential deposition (UPD) process, leading to the formation of small Au nanoparticles. These small Au nanoparticles are then coalesced into nanorings on small Pd nanoplates. The outer diameter of Au nanorings is tuned by varying the size of Pd nanoplates. The smallest Au nanorings are evaluated as the catalyst towards hydrogenation of 4-nitrophenol, showing substantially enhanced catalytic activity relative to the Au nanoparticles with the same size. This enhancement in catalytic activity can be attributed to the unique structure features including the large specific surface areas, convenient accessibility of both interior and exterior surfaces for the reactants, and existence of highly active sites in the interior part.

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Publication details

The article was received on 22 Jul 2017, accepted on 28 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01350G
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Size-controlled synthesis of Au nanorings on Pd ultrathin nanoplates as efficient catalysts for hydrogenation

    Y. Han, W. Wang, P. Jiang, Y. Yan, H. Zhang and D. Yang, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01350G

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