Revealing chemical ordering in Pt-Co nanoparticles using electronic structure calculations and X-ray photoelectron spectroscopy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10319748" target="_blank" >RIV/00216208:11320/15:10319748 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/c5cp01070e" target="_blank" >http://dx.doi.org/10.1039/c5cp01070e</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c5cp01070e" target="_blank" >10.1039/c5cp01070e</a>

Result language

angličtina

Original language name

Revealing chemical ordering in Pt-Co nanoparticles using electronic structure calculations and X-ray photoelectron spectroscopy

Original language description

The high catalytic activity of Pt-Co nanoalloys in oxygen reduction and other reactions is usually attributed to their Pt-rich surfaces. However, identification of the precise near-surface structure is by no means easily achievable experimentally. In this work we systematically analyzed the chemical ordering and surface composition of PtXCo79-X and PtXCo140-X bimetallic nanoparticles by means of a recently developed method based on topological energy expressions and electronic structure calculations. Ptis found to segregate on the surface, especially on corner and edge sites, forming a one atomic layer thick skin independent of the size and composition of the nanoparticle. In turn, the subsurface shell of the particle is composed mostly of Co, whereasthe core area has a mixed composition, which depends on the overall stoichiometry. The formation of an outer Pt shell is corroborated by thoroughly analyzed data of X-ray photoelectron spectroscopy experiments performed with various phot

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA13-10396S" target="_blank" >GA13-10396S: New materials for planar fuel cells</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Volume of the periodical

17

Issue of the periodical within the volume

42

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

28298-28310

UT code for WoS article

000363686800042

EID of the result in the Scopus database

2-s2.0-84945272654