Segregation and stability at Pt{sub 3}Ni(111) surfaces and Pt{sub 75}Ni{sub 25} nanoparticles.

Journal Article · Mon Sep 01 04:00:00 EDT 2008 · Electrochim. Acta

DOI:https://doi.org/10.1016/j.electacta.2007.11.063· OSTI ID:1009351

Fowler, B; Lucas, C A; Omer, A; Wang, G; Stamenkovic, V R; Markovic, N M ^[1]

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1. Materials Science Division

Using in situ surface X-ray diffraction we have determined the atomic structure and stability of a Pt{sub 3}Ni(1 1 1) surface in the electrochemical environment. Surface segregation leads to a pure Pt(1 1 1) skin with enrichment of Ni in the sub-surface atomic layer that determines the surface electronic structure. The Pt-skin surface exhibits inward relaxation upon the adsorption of oxygenated species and this explains the surface stability compared to pure Pt(1 1 1). Using Monte Carlo calculations it is shown that nanoparticles with the same surface composition and stochiometry are energetically stable.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; EPSRC-UK
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1009351
• Report Number(s): ANL/MSD/JA-68953
• Journal Information: Electrochim. Acta, Journal Name: Electrochim. Acta Journal Issue: 21 ; Sep. 2008 Vol. 53; ISSN 0013-4686
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ELECTRONIC STRUCTURE
MONTE CARLO METHOD
NANOSTRUCTURES
NICKEL ALLOYS
PLATINUM ALLOYS
SEGREGATION
STABILITY
SURFACE PROPERTIES
X-RAY DIFFRACTION