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:
影响因子:
--
通讯作者:
Ellaby T
中科院分区:
文献类型:
--
作者:
Ellaby T
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.
登录
查看更多内容
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
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;
影响因子:
2.8
作者:
K. MacArthur;M. Heggen;R. Dunin‐Borkowski
通讯作者:
R. Dunin‐Borkowski
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
H. Okamoto
通讯作者:
H. Okamoto