Expansion of interatomic distances in platinum catalyst nanoparticles

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	Expansion of interatomic distances in platinum catalyst nanoparticles
	K. Du; F. Emst; M. C. Pelsozy; J. Barthel; K. Tillmann
	2010
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	58 期号:3 页码:836-845
摘要	We study the atomistic structure of Pt catalyst nanoparticles using HRTEM (high-resolution transmission electron microscopy). The particles exhibit a faceted, cubo-octahedral shape, extended planar defects, and mono-atomic surface steps. HRTEM imaging with negative spherical aberration yielded atomic-resolution images with a minimum of artifacts. Combining digital image processing, quantitative image analysis, and HRTEM image simulations to determine local variations of the spacing between neighboring Pt atom columns, we have found an expansion of the lattice parameter in the particle core and even larger, locally varying expansion of Pt-Pt next-neighbor distances at the particle surface. The latter likely originates from an amorphous oxide on the nanoparticle surface and/or dissolution of oxygen on subsurface sites. These structural features may significantly impact the catalytic activity of Pt nanoparticles. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[du, k.; emst, f.] case western reserve univ, dept mat sci & engn, cleveland, oh 44106 usa. [du, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [pelsozy, m. c.] case western reserve univ, dept chem engn, cleveland, oh 44106 usa. [barthel, j.; tillmann, k.] forschungszentrum julich, ernst ruska ctr mikroskopie & spektroskopie elekt, d-52425 julich, germany. [barthel, j.; tillmann, k.] forschungszentrum julich, inst festkorperforsch, d-52425 julich, germany.;emst, f (reprint author), case western reserve univ, dept mat sci & engn, cleveland, oh 44106 usa;frank.emst@case.edu
关键词	Nanoparticles Catalysts Atomistic Structure Quantitative High-resolution Transmission Electron Microscopy Spherical-aberration-adjusted Transmission Electron Microscopy Transmission Electron-micrographs Pt-co Electrocatalysts Oxygen Reduction Spherical-aberration Lattice-parameters Atomic-resolution Materials Science Surface-tension Hrem Images In-situ
URL	查看原文
WOS记录号	WOS:000274765600010
引用统计	被引频次：25[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31082
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Du,F. Emst,M. C. Pelsozy,et al. Expansion of interatomic distances in platinum catalyst nanoparticles[J]. Acta Materialia,2010,58(3):836-845.
APA	K. Du,F. Emst,M. C. Pelsozy,J. Barthel,&K. Tillmann.(2010).Expansion of interatomic distances in platinum catalyst nanoparticles.Acta Materialia,58(3),836-845.
MLA	K. Du,et al."Expansion of interatomic distances in platinum catalyst nanoparticles".Acta Materialia 58.3(2010):836-845.