Strain effects in core-shell PtCo nanoparticles: a comparison of experimental observations and computational modelling.

Strain effects in core-shell PtCo nanoparticles: a comparison of experimental observations and computational modelling.
复制标题

核壳 PtCo 纳米粒子的应变效应:实验观察与计算模型的比较。

DOI:
10.1039/d0cp04318d
复制
发表时间:
2020
期刊:
PCCP
影响因子:
--
通讯作者:
Ellaby T
Ellaby T
中科院分区:
--
文献类型:
--
作者:
Ellaby T

文献摘要

参考文献

相似文献

长期以来,人们一直认为由再生金属引起的 Pt 纳米合金应变是催化性能改变的主要贡献者。在这里,我们结合计算模型和显微镜实验来研究 PtCo 纳米粒子的应变。我们的模型结合了分子动力学 (MD) 和大规模密度泛函理论 (DFT),并使用环形暗场扫描透射电子显微镜 (ADF-STEM) 进行实验工作。我们使用 Pt568Co18 纳米粒子对 DFT 的原子间势进行了广泛的验证。建模可以访问可与 2D ADF-STEM 图像进行比较的 3 维结构,我们用它来建立对纳米粒子结构和组成的理解。测量了 PtCo 和纯 Pt 纳米颗粒的应变,并将 MD 退火模型与 ADF-STEM 图像进行了比较。我们的分析是逐层进行的,观察到 Pt 和 PtCo 合金纳米粒子之间的明显趋势。据我们所知,我们首次展示了一种可以使用详细原子模拟来增强和帮助解释 ADF-STEM 应变图实验结果的方法,这将增强其在表征中的应用,以开发改进的催化剂。
Strain in Pt nanoalloys induced by the secondary metal has long been suggested as a major contributor to the modification of catalytic properties. Here, we investigate strain in PtCo nanoparticles using a combination of computational modelling and microscopy experiments. We have used a combination of molecular dynamics (MD) and large-scale density functional theory (DFT) for our models, alongside experimental work using annular dark field scanning transmission electron microscopy (ADF-STEM). We have performed extensive validation of the interatomic potential against DFT using a Pt568Co18 nanoparticle. Modelling gives access to 3 dimensional structures that can be compared to the 2D ADF-STEM images, which we use to build an understanding of nanoparticle structure and composition. Strain has been measured for PtCo and pure Pt nanoparticles, with MD annealed models compared to ADF-STEM images. Our analysis was performed on a layer by layer basis, where distinct trends between the Pt and PtCo alloy nanoparticles are observed. To our knowledge, we show for the first time a way in which detailed atomistic simulations can be used to augment and help interpret the results of ADF-STEM strain mapping experiments, which will enhance their use in characterisation towards the development of improved catalysts.
DOI: 10.1186/s40679-017-0042-5
发表时间: 2017
影响因子: --
作者:
Nord M;Vullum PE;MacLaren I;Tybell T;Holmestad R
通讯作者: Holmestad R
DOI: 10.1039/c8cp04798g
发表时间: 2018-10
期刊: Physical chemistry chemical physics : PCCP
影响因子: --
作者:
L. G. Verga;A. Russell;Chris-Kriton Skylaris
通讯作者: L. G. Verga;A. Russell;Chris-Kriton Skylaris
DOI: 10.1002/chem.201000296
发表时间: 2010-06
期刊: Chemistry
影响因子: --
作者:
F. Viñes;Y. Lykhach;T. Staudt;M. Lorenz;C. Papp;H. Steinrück;J. Libuda;Konstantin M. Neyman;
通讯作者: F. Viñes;Y. Lykhach;T. Staudt;M. Lorenz;C. Papp;H. Steinrück;J. Libuda;Konstantin M. Neyman;
从单投影 ADF STEM 图像和 EDX 图评估 PtNi 纳米粒子的 3D 结构
DOI: --
发表时间: 2018
影响因子: 2.8
作者:
K. MacArthur;M. Heggen;R. Dunin‐Borkowski
通讯作者: R. Dunin‐Borkowski
Co-Pt(钴铂)
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
H. Okamoto
通讯作者: H. Okamoto