Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2015, Article ID 601617, 10 pages
http://dx.doi.org/10.1155/2015/601617
Review Article

Core-Shell Nanocatalysts Obtained in Reverse Micelles: Structural and Kinetic Aspects

1Physical Chemistry Department, University of Vigo, 36310 Vigo, Spain
2Laboratory of Magnetism and Nanotechnology, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain

Received 15 May 2015; Accepted 15 September 2015

Academic Editor: Xianwen Zhang

Copyright © 2015 Concha Tojo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ability to control the metal arrangement in bimetallic nanocatalysts is the key to improving their catalytic activity. To investigate how metal distribution in nanostructures can be modified, we developed a computer simulation model on the synthesis of bimetallic nanoparticles obtained in microemulsions by a one-pot method. The calculations allow predicting the metal arrangement in nanoparticle under different experimental conditions. We present results for two couples of metals, Au/Pt ( V) and Au/Ag ( V), but conclusions can be generalized to other bimetallic pairs with similar difference in standard reduction potentials. It was proved that both surface and interior compositions can be controlled at nanometer resolution easily by changing the initial reactant concentration inside micelles. Kinetic analysis demonstrates that the confinement of reactants inside micelles has a strong effect on the reaction rates of the metal precursors. As a result, the final nanocatalyst shows a more mixed core and a better defined shell as concentration is higher.