TY - JOUR

T1 - Formation of intermetallic PdIn nanoparticles

T2 - influence of surfactants on nanoparticle atomic structure

AU - Wang, Baiyu

AU - Mathiesen, Jette K.

AU - Kirsch, Andrea

AU - Schlegel, Nicolas

AU - Anker, Andy S.

AU - Johansen, Frederik L.

AU - Kjær, Emil T.S.

AU - Aalling-Frederiksen, Olivia

AU - Nielsen, Tobias M.

AU - Thomsen, Maria S.

AU - Jakobsen, Rasmus K.

AU - Arenz, Matthias

AU - Jensen, Kirsten M.Ø.

N1 - Funding Information: We are grateful for funding from the Villum Foundation through a Villum Young Investigator Grant (VKR00015416). Funding from the Danish Ministry of Higher Education and Science through the SMART Lighthouse is gratefully acknowledged. We acknowledge support from the Danish National Research Foundation Center for High Entropy Alloy Catalysis (DNRF 149). M. A. received funding from the Swiss National Science Foundation (SNSF) via the project no. 200021 184742. The Danish Research Council is acknowledged for covering travel expenses in relation to the synchrotron experiment (DanScatt). We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at beamline P21.1 and we would like to thank Soham Banerjee and Ann-Christin Dippel for assistance in using the beamline. Beamtime was allocated for proposal I-20210946 EC. Publisher Copyright: © 2023 RSC

PY - 2023

Y1 - 2023

N2 - Bimetallic nanoparticles have been extensively studied as electrocatalysts due to their superior catalytic activity and selectivity compared to their monometallic counterparts. The properties of bimetallic materials depend on the ordering of the metals in the structure, and to tailor-make materials for specific applications, it is important to be able to control the atomic structure of the materials during synthesis. Here, we study the formation of bimetallic palladium indium nanoparticles to understand how the synthesis parameters and additives used influence the atomic structure of the obtained product. Specifically, we investigate a colloidal synthesis, where oleylamine was used as the main solvent while the effect of two surfactants, oleic acid (OA) and trioctylphosphine (TOP) was studied. We found that without TOP included in the synthesis, a Pd-rich intermetallic phase with the Pd3In structure initially formed, which transformed into large NPs of the CsCl-structured PdIn phase. When TOP was included, the syntheses yielded both In2O3 and Pd3In. In situ X-ray total scattering with Pair Distribution Function analysis was used to study the formation process of PdIn bimetallic NPs. Our results highlight how seemingly subtle changes to material synthesis methods can have a large influence on the product atomic structure.

AB - Bimetallic nanoparticles have been extensively studied as electrocatalysts due to their superior catalytic activity and selectivity compared to their monometallic counterparts. The properties of bimetallic materials depend on the ordering of the metals in the structure, and to tailor-make materials for specific applications, it is important to be able to control the atomic structure of the materials during synthesis. Here, we study the formation of bimetallic palladium indium nanoparticles to understand how the synthesis parameters and additives used influence the atomic structure of the obtained product. Specifically, we investigate a colloidal synthesis, where oleylamine was used as the main solvent while the effect of two surfactants, oleic acid (OA) and trioctylphosphine (TOP) was studied. We found that without TOP included in the synthesis, a Pd-rich intermetallic phase with the Pd3In structure initially formed, which transformed into large NPs of the CsCl-structured PdIn phase. When TOP was included, the syntheses yielded both In2O3 and Pd3In. In situ X-ray total scattering with Pair Distribution Function analysis was used to study the formation process of PdIn bimetallic NPs. Our results highlight how seemingly subtle changes to material synthesis methods can have a large influence on the product atomic structure.

U2 - 10.1039/d3na00582h

DO - 10.1039/d3na00582h

M3 - Journal article

C2 - 38059038

AN - SCOPUS:85176259041

VL - 5

SP - 6913

EP - 6924

JO - Nanoscale Advances

JF - Nanoscale Advances

SN - 2516-0230

IS - 24

ER -