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Expansion of interatomic distances in platinum catalyst nanoparticles
文献类型：期刊论文
| 作者 | K. Du ; F. Emst ; M. C. Pelsozy ; J. Barthel ; K. Tillmann |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2010 |
| 卷号 | 58期号:3页码:836-845 |
| 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 |
| ISSN号 | 1359-6454 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31082]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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