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Catalysts 2017, 7(2), 68; doi:10.3390/catal7020068

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

1
Physical Chemistry Department, University of Vigo, E-36310 Vigo, Spain
2
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Alain Roucoux and Audrey Denicourt
Received: 28 December 2016 / Revised: 8 February 2017 / Accepted: 10 February 2017 / Published: 17 February 2017
(This article belongs to the Special Issue Soluble Nanoparticles in Catalytic Applications)
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Abstract

A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: (1) The metal segregation in a bimetallic nanocatalysts is the result of the combination of three main kinetic parameters: the reduction rate of metal precursors (related to reduction standard potentials), the material intermicellar exchange rate (determined by microemulsion composition), and the metal precursors concentration; (2) A minimum difference between the reduction standard potentials of the two metals of 0.20 V is needed to obtain a core-shell structure. For values ∆ε0 smaller than 0.20 V the obtaining of alloys cannot be avoided, neither by changing the microemulsion nor by increasing metal concentration; (3) As a rule, the higher the film flexibility around the micelles, the higher the degree of mixture in the nanocatalyst; (4) A minimum concentration of metal precursors is required to get a core-shell structure. This minimum concentration depends on the microemulsion flexibility and on the difference in reduction rates. View Full-Text
Keywords: bimetallic nanoparticles; nanocatalysts; microemulsion; simulation; one-pot method bimetallic nanoparticles; nanocatalysts; microemulsion; simulation; one-pot method
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Tojo, C.; Buceta, D.; López-Quintela, M.A. On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions. Catalysts 2017, 7, 68.

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