Bimetallic Pd-Rh Nanoparticles Supported on Co3O4(111): Atomic Ordering and Stability

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10492298" target="_blank" >RIV/00216208:11320/24:10492298 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ze2UiHJFFO" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ze2UiHJFFO</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.4c07406" target="_blank" >10.1021/acs.jpcc.4c07406</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bimetallic Pd-Rh Nanoparticles Supported on Co3O4(111): Atomic Ordering and Stability

Popis výsledku v původním jazyce

We have investigated the atomic ordering and stability of monometallic Rh and Pd nanoparticles and bimetallic Pd@Rh and Rh@Pd core@shell nanoparticles supported on well-ordered Co3O4(111) films on Ir(100) by means of synchrotron radiation photoelectron spectroscopy and scanning tunneling microscopy. The thermal stabilities of these model systems are controlled by the electronic metal support interaction associated with charge transfer at the metal/oxide interface. This effect is most pronounced in the Rh/Co3O4(111) model system. It is associated with the formation of atomically dispersed Rh3+ species at the metal/oxide interface and the growth of highly dispersed Rh nanoparticles. The system is stable up to 450 K. Annealing of the Rh/Co3O4(111) model system triggers sintering of the Rh nanoparticles above 450 K and Rh dissolution into the Co3O4(111) substrate above 550 K. The morphologies of the Pd@Rh and Rh@Pd core@shell nanoparticles are similar to those observed for the Rh/Co3O4(111) model system. With respect to atomic ordering, the Rh@Pd core@shell nanoparticles are fairly stable, while segregation of Pd in the Pd@Rh core@shell nanoparticles occurs upon annealing to 550 K. Above 550 K, redistribution of the charge at the metal/oxide interface leads to sintering, dissolution of Rh into the Co3O4(111) substrate and collapse of the core@shell nanoparticles. In particular, phase separation in the Pd@Rh and Rh@Pd core@shell nanoparticles occurs upon annealing above 550 K, yielding Rh-rich and Pd-rich nanoparticles on Co3O4(111).

Název v anglickém jazyce

Bimetallic Pd-Rh Nanoparticles Supported on Co3O4(111): Atomic Ordering and Stability

Popis výsledku anglicky

We have investigated the atomic ordering and stability of monometallic Rh and Pd nanoparticles and bimetallic Pd@Rh and Rh@Pd core@shell nanoparticles supported on well-ordered Co3O4(111) films on Ir(100) by means of synchrotron radiation photoelectron spectroscopy and scanning tunneling microscopy. The thermal stabilities of these model systems are controlled by the electronic metal support interaction associated with charge transfer at the metal/oxide interface. This effect is most pronounced in the Rh/Co3O4(111) model system. It is associated with the formation of atomically dispersed Rh3+ species at the metal/oxide interface and the growth of highly dispersed Rh nanoparticles. The system is stable up to 450 K. Annealing of the Rh/Co3O4(111) model system triggers sintering of the Rh nanoparticles above 450 K and Rh dissolution into the Co3O4(111) substrate above 550 K. The morphologies of the Pd@Rh and Rh@Pd core@shell nanoparticles are similar to those observed for the Rh/Co3O4(111) model system. With respect to atomic ordering, the Rh@Pd core@shell nanoparticles are fairly stable, while segregation of Pd in the Pd@Rh core@shell nanoparticles occurs upon annealing to 550 K. Above 550 K, redistribution of the charge at the metal/oxide interface leads to sintering, dissolution of Rh into the Co3O4(111) substrate and collapse of the core@shell nanoparticles. In particular, phase separation in the Pd@Rh and Rh@Pd core@shell nanoparticles occurs upon annealing above 550 K, yielding Rh-rich and Pd-rich nanoparticles on Co3O4(111).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Svazek periodika

129

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

983-992

Kód UT WoS článku

001380370100001

EID výsledku v databázi Scopus

2-s2.0-85213018035