Comparative Study on Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

Science Press Release Distribution Services

Comparative Study on Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

June 4, 2021 Chemical Science 0

A comparison of several bimetallic nanocatalysts made from microemulsion utilising a one-pot approach was conducted. The combination of experimental observations and simulation research provides a complete understanding of the elements that influence nanoparticle architecture: 1.- In bimetallic nanocatalysts, metal segregation is the result of a combination of three main kinetic parameters: metal precursor reduction rate (related to reduction standard potentials), material intermicellar exchange rate (determined by microemulsion composition), and metal precursor concentration. 2.- To create a core-shell structure, a minimum difference of 0.20 V between the reduction standard potentials of the two metals is required. The formation of alloys cannot be avoided for values ° less than 0.20 V, regardless of whether the microemulsion is changed or the metal concentration is increased. 3.- The higher the degree of mixing in the nanocatalyst, the more flexible the film around the micelles is. 4.- A core-shell structure requires a minimal concentration of metal precursors. This minimum concentration is determined by the flexibility of the microemulsion as well as the differential in reduction rates.

Author (s) Details

C. Tojo
Physical Chemistry Department, University of Vigo, E-36310, Vigo, Spain.

D. Buceta
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

M. A. López-Quintela
Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782, Santiago de Compostela, Spain.

View Book :- https://stm.bookpi.org/CPCS-V10/article/view/1233

 

Leave a Reply

Your email address will not be published. Required fields are marked *