Role of RuO2(100) in surface oxidation and CO oxidation catalysis on Ru(0001)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10334015" target="_blank" >RIV/00216208:11320/16:10334015 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5wLEfe_CjR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5wLEfe_CjR</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c5cp05807d" target="_blank" >10.1039/c5cp05807d</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of RuO2(100) in surface oxidation and CO oxidation catalysis on Ru(0001)

Popis výsledku v původním jazyce

We have studied the oxidation of the Ru(0001) surface by in situ microscopy during exposure to NO2, an efficient source of atomic oxygen, at elevated temperatures. In a previous investigation [Flege et al., Phys. Rev. B: Condens. Matter Mater. Phys., 2008, 78, 165407], at O coverages exceeding 1 monolayer, using the combination of intensity voltage (I(V) low-energy electron microscopy (LEEM) and multiple scattering calculations for the (00) beam in the very-tow-energy range (E &lt;= 50 eV) we identified three surface components during the initial Ru oxidation: a (1 x 1)-O chemisorption phase, the RuO2(110) oxide phase, and a surface oxide structure characterized by a tritayer O-Ru-O stacking. Here, we use dark-field LEEM imaging and micro-illumination low-energy electron diffraction in the range of 100 to 400 eV to show that this trilayer phase is actually a RuO2(100)-(1 x 1) phase with possibly mixed O and Ru surface terminations. This identification rationalizes the thermodynamic stability of this phase at elevated temperatures and is consistent with the observation of catalytic activity of the phase in CO oxidation.

Název v anglickém jazyce

Role of RuO2(100) in surface oxidation and CO oxidation catalysis on Ru(0001)

Popis výsledku anglicky

We have studied the oxidation of the Ru(0001) surface by in situ microscopy during exposure to NO2, an efficient source of atomic oxygen, at elevated temperatures. In a previous investigation [Flege et al., Phys. Rev. B: Condens. Matter Mater. Phys., 2008, 78, 165407], at O coverages exceeding 1 monolayer, using the combination of intensity voltage (I(V) low-energy electron microscopy (LEEM) and multiple scattering calculations for the (00) beam in the very-tow-energy range (E &lt;= 50 eV) we identified three surface components during the initial Ru oxidation: a (1 x 1)-O chemisorption phase, the RuO2(110) oxide phase, and a surface oxide structure characterized by a tritayer O-Ru-O stacking. Here, we use dark-field LEEM imaging and micro-illumination low-energy electron diffraction in the range of 100 to 400 eV to show that this trilayer phase is actually a RuO2(100)-(1 x 1) phase with possibly mixed O and Ru surface terminations. This identification rationalizes the thermodynamic stability of this phase at elevated temperatures and is consistent with the observation of catalytic activity of the phase in CO oxidation.

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

<a href="/cs/project/EF16_013%2F0001788" target="_blank" >EF16_013/0001788: Laboratoř fyziky povrchů - Optická dráha pro výzkum materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Svazek periodika

18

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

213-219

Kód UT WoS článku

000368755500022

EID výsledku v databázi Scopus

2-s2.0-84951334978