Experimental and Theoretical Structural Investigation of AuPt Nanoparticles Synthesized Using a Direct Electrochemical Method

Journal of the American Chemical Society
Aliya S LappRichard M Crooks

Abstract

In this report, we examine the structure of bimetallic nanomaterials prepared by an electrochemical approach known as hydride-terminated (HT) electrodeposition. It has been shown previously that this method can lead to deposition of a single Pt monolayer on bulk-phase Au surfaces. Specifically, under appropriate electrochemical conditions and using a solution containing PtCl42-, a monolayer of Pt atoms electrodeposits onto bulk-phase Au immediately followed by a monolayer of H atoms. The H atom capping layer prevents deposition of Pt multilayers. We applied this method to ∼1.6 nm Au nanoparticles (AuNPs) immobilized on an inert electrode surface. In contrast to the well-defined, segregated Au/Pt structure of the bulk-phase surface, we observe that HT electrodeposition leads to the formation of AuPt quasi-random alloy NPs rather than the core@shell structure anticipated from earlier reports relating to deposition onto bulk phases. The results provide a good example of how the phase behavior of macro materials does not always translate to the nano world. A key component of this study was the structure determination of the AuPt NPs, which required a combination of electrochemical methods, electron microscopy, X-ray absorption spec...Continue Reading

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Citations

Nov 11, 2020·Nanomaterials·Wan-Cheng ZhangLi Zhou
Oct 29, 2019·Chemical Reviews·Jamie A TrindellRichard M Crooks
Aug 1, 2019·ACS Applied Materials & Interfaces·Wei Hong, Christina W Li
Dec 6, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Aliya S LappRichard M Crooks

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