On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions
AbstractA 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
- Supplementary File 1:
PDF-Document (PDF, 233 KB)
Share & Cite This Article
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.
Tojo C, Buceta D, López-Quintela MA. On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions. Catalysts. 2017; 7(2):68.Chicago/Turabian Style
Tojo, Concha; Buceta, David; López-Quintela, Manuel A. 2017. "On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions." Catalysts 7, no. 2: 68.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.