Synthesis of monodisperse high entropy alloy nanocatalysts from core@shell nanoparticles

High-entropy alloy (HEA) nanoparticles (NPs) hold great promise in electrocatalysis because of their nearly unlimited compositions, tailorable active sites, and high durability. However, the synthesis of these compositionally complex structures as monodisperse NPs remains a challenge by colloidal ro...

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Bibliographic Details
Published in:Nanoscale horizons 2021-03, Vol.6 (3), p.231-237
Main Authors: Chen, Yifan, Zhan, Xun, Bueno, Sandra L. A, Shafei, Ibrahim H, Ashberry, Hannah M, Chatterjee, Kaustav, Xu, Lin, Tang, Yawen, Skrabalak, Sara E
Format: Article
Language:English
Subjects:
Annealing
Catalysis
Chemical synthesis
Durability
Electron transfer
High entropy alloys
Nanoalloys
Nanoparticles
Oxygen reduction reactions
Palladium
Phase separation
Platinum
Single crystals
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Summary:High-entropy alloy (HEA) nanoparticles (NPs) hold great promise in electrocatalysis because of their nearly unlimited compositions, tailorable active sites, and high durability. However, the synthesis of these compositionally complex structures as monodisperse NPs remains a challenge by colloidal routes because the different rates of metal precursor reduction lead to phase separation. Here, we report the conversion of core@shell NPs into HEA NPs through annealing, with conservation of sample monodispersity. This potentially general route for high-quality HEA NPs was demonstrated by preparing PdCu@PtNiCo NPs via seed-mediated co-reduction, wherein Pt, Ni, and Co were co-deposited on PdCu seeds in solution. These multimetallic NPs were then converted to single-crystalline and single-phase PdCuPtNiCo NPs through annealing. On account of their small particle size, highly dispersed Pt/Pd content, and low elemental diffusivity, these HEA NPs were found to be a highly efficient and durable catalyst for the oxygen reduction reaction. They were also highly selective for the four-electron transfer pathway. We expect that this new synthetic strategy will facilitate the synthesis of new HEA NPs for catalysis and other applications. Annealing core@shell nanoparticles (NPs) yields high-entropy alloy NPs. Owing to their dispersed Pt/Pd content and low elemental diffusivity, they exhibit enhanced electrocatalytic performance and durability for the oxygen reduction reaction.
ISSN:2055-6756
2055-6764
2055-6764
DOI:10.1039/d0nh00656d