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Shape-dependent electrocatalytic activity of free gold nanoparticles toward glucose oxidation

Authors
  • Hebié, Seydou1
  • Kokoh, K. Boniface1
  • Servat, Karine1
  • Napporn, Teko W.1
  • 1 Université de Poitiers, IC2MP, UMR 7285 CNRS, 4, rue Michel Brunet B-27, Poitiers Cedex, 86022, France , Poitiers Cedex (France)
Type
Published Article
Journal
Gold Bulletin
Publisher
Springer Berlin Heidelberg
Publication Date
Nov 26, 2013
Volume
46
Issue
4
Pages
311–318
Identifiers
DOI: 10.1007/s13404-013-0119-4
Source
Springer Nature
Keywords
License
Green

Abstract

The synthesis of shape and size-controlled free gold nanoparticles (AuNPs) was achieved by wet chemical methods. The UV–vis spectroscopy measurements and transmission electron microscopy characterizations confirmed the fine distribution in size and shape of the AuNPs. The zeta potential measurements permitted the evaluation of the stability of the AuNPs suspension. For the first time, the shape dependence on the electrocatalytic activity of these NPs is thoroughly investigated. The underpotential deposition (UPD) of lead reveals that their crystallographic facets are affected by their shape and growth process. Moreover, the glucose oxidation reaction strongly depends on the shape of AuNPs. Indeed, the gold nanocuboids (GNCs) and the spherical gold nanoparticles (GNSs) are significantly more active than the gold nanorods (GNRs) followed by the polyhedrons (GNPs). The oxidation process occurs at low potential for GNCs whereas the current densities are slightly higher for GNSs electrodes. Most importantly, the control of the shape and structure of nanomaterials is of high technological interest because of the strong correlation between these parameters and their optical, electrical and electrocatalytic properties.

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