RT Journal Article
T1 Tailored surface composition of Au/Pt nanocatalysts synthesized in microemulsions: a simulation study
A1 Pérez Álvarez, Jorge
A1 Tojo Suárez, Maria Concepcion
A1 Buceta Fernández, David
A1 López Quintela, M. Arturo
K1 2210.03 Cinética Química
K1 2204.01 Coloides
K1 3303.01 Tecnología de la Catálisis
AB Au/Pt nanoparticles show an optimized catalytic activity when compared with Pt nanoparticles because Pt activity is improved by the presence of Au on the surface. It was checked whether a controllable surface composition can be achieved by the simple strategy of varying the Au : Pt ratio. We present an in-depth kinetic simulation study on the influence of Au : Pt ratio on the formation of Au/Pt nanoparticles synthesized in microemulsions. This study is able to explain the resulting nanoarrangement as a function of kinetic parameters such as Au : Pt ratio and intermicellar exchange rate. The role of the micelles as a dosing pump of the Au precursor explains that a higher Au amount results in a Au reduction which takes place over a longer period of time. It implies that Au is deposited until longer stages of the synthesis, so Au is present at the nanoparticle surface. Micelles as reaction media produce a minor impact on Pt due to its slower reduction. These different kinetic behaviours of Au and Pt give rise to a surface composition which can be tailored by tuning the Au : Pt ratio. Numerical results on surface composition successfully reproduce experimental data and further support the outcomes of the degree of atomic mixing under different Au : Pt ratios.
PB RSC Advances
SN 20462069
YR 2020
FD 2020
LK http://hdl.handle.net/11093/2276
UL http://hdl.handle.net/11093/2276
LA eng
NO RSC Advances, 10(69): 42277-42286 (2020)
NO Xunta de Galicia | Ref. ED431E2018/08
DS Investigo
RD 18-sep-2024