Segregation and stability at Pt3Ni(111) surfaces and Pt75Ni25 nanoparticles

被引：60
|
作者：
Fowler, Ben [1 ]
Lucas, Christopher A. [1 ]
Omer, Ahmed [1 ]
Wang, Guofeng [2 ]
Stamenkovic, Vojislav R. [3 ]
Markovic, Nenad M. [3 ]
机构：
[1] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England
[2] Univ S Carolina, Dept Chem & Phys, Aiken, SC 29801 USA
[3] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
来源：
ELECTROCHIMICA ACTA | 2008年 / 53卷 / 21期
基金：
英国工程与自然科学研究理事会;
关键词：
electrocatalysis; single crystal alloy; X-ray scattering; surface segregation; nanoparticles;
D O I：
10.1016/j.electacta.2007.11.063
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Using in situ surface X-ray diffraction we have determined the atomic structure and stability of a Pt3Ni(111) surface in the electrochemical environment. Surface segregation leads to a pure Pt(111) 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(111). Using Monte Carlo calculations it is shown that nanoparticles with the same surface composition and stochiometry are energetically stable. (C) 2007 Elsevier Ltd. All rights reserved.
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收藏
页码：6076 / 6080
页数：5
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