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Title: Experimental and Theoretical Structural Investigation of AuPt Nanoparticles Synthesized using a Direct Electrochemical Method

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b12306· OSTI ID:1436448
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [5];  [5]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Texas, Austin, TX (United States). Texas Materials Inst., and Dept. of Chemistry
  2. Univ. of Texas, Austin, TX (United States). Inst. for Computational and Engineering Sciences, and Dept. of Chemistry
  3. Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
  4. Univ. of Texas, Austin, TX (United States). Texas Materials Inst., and Dept. of Chemistry; Wayne State Univ., Detroit, MI (United States). Dept. of Chemistry
  5. Thermo Fisher Scientific, Hillsboro, OR (United States)

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 spectroscopy, and theory (DFT and MD).

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0010576
OSTI ID:
1436448
Alternate ID(s):
OSTI ID: 1617139
Report Number(s):
BNL-203640-2018-JAAM
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 20; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Growth of Porous Ag@AuCu Trimetal Nanoplates Assisted by Self-Assembly journal November 2020