Expansion of interatomic distances in platinum catalyst nanoparticles

被引：25

作者：

Du, K. ^{[1
,2
]}

Emst, F. ^{[1
]}

Pelsozy, M. C. ^{[3
]}

Barthel, J. ^{[4
,5
]}

Tillmann, K. ^{[4
,5
]}

机构：

[1] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA

[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[3] Case Western Reserve Univ, Dept Chem Engn, Cleveland, OH 44106 USA

[4] Forschungszentrum Julich, Ernst Ruska Ctr Mikroskopie & Spektroskopie Elekt, D-52425 Julich, Germany

[5] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 03期

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;

D O I：

10.1016/j.actamat.2009.09.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：836 / 845

页数：10

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